Russian Academy of Sciences, Siberian Branch, Institute of Solar-Terrestrial Physics

Irkutsk incoherent scatter radar

Observatory of radiophysical diagnostics of the atmosphere

Registered SO during ionospheric observations

SPU -> 2012-12-31 -> Unknown object

Date: 2012-12-31 Unknown object

dt	N	S/N (avg)	R (avg)
68.282 sec	285	11.369	702 km

N	Time	Hours	Freq (kHz)	R(km)	V	S/N	dFi
1	02:42:23.875	2.706632	159000	728.496	-2.2	2.715	112.728
2	02:42:23.922	2.706645	159000	728.496	-2.248	2.7022	-58.454
3	02:42:23.922	2.706645	159000	731.494	-2.233	1.3795	-58.454
4	02:42:24.030	2.706675	159000	728.496	-2.187	3.6202	-112.721
5	02:42:24.030	2.706675	159000	726.997	-2.166	2.0891	-112.721
6	02:42:24.077	2.706688	159000	728.496	-2.198	2.762	127.945
7	02:42:24.077	2.706688	159000	726.997	-2.199	4.2617	127.945
8	02:42:24.203	2.706723	159000	728.496	-2.184	5.0691	-133.273
9	02:42:24.203	2.706723	159000	728.496	-2.191	3.1915	-133.273
10	02:42:24.235	2.706732	159000	726.997	-2.214	3.3291	-128.875
11	02:42:24.235	2.706732	159000	726.997	-2.181	4.9869	-128.875
12	02:42:24.358	2.706766	159000	728.496	-2.108	5.2533	-86.682
13	02:42:24.358	2.706766	159000	726.997	-2.184	4.2404	-86.682
14	02:42:24.404	2.706779	159000	726.997	-2.14	5.2826	36.454
15	02:42:24.404	2.706779	159000	726.997	-2.121	4.4327	36.454
16	02:42:24.530	2.706814	159000	726.997	-2.135	4.8182	-0.797
17	02:42:24.530	2.706814	159000	726.997	-2.101	4.3621	-0.797
18	02:42:24.563	2.706823	159000	726.997	-2.155	4.3897	-8.224
19	02:42:24.563	2.706823	159000	726.997	-2.176	4.6711	-8.224
20	02:42:24.685	2.706857	159000	728.496	-2.093	3.6618	-136.808
21	02:42:24.685	2.706857	159000	725.498	-2.136	3.9243	-136.808
22	02:42:24.736	2.706871	159000	725.498	-2.107	2.8024	49.925
23	02:42:24.736	2.706871	159000	726.997	-2.123	3.9711	49.925
24	02:42:24.858	2.706905	159000	728.496	-2.159	2.1347	-33.751
25	02:42:24.858	2.706905	159000	725.498	-2.095	2.9329	-33.751
26	02:42:24.890	2.706914	159000	726.997	-2.034	1.5581	35.03
27	02:42:24.890	2.706914	159000	723.999	-2.115	2.8184	35.03
28	02:42:25.016	2.706949	159000	726.997	-2.094	1.871	-0.462
29	02:42:25.063	2.706962	159000	723.999	-2.106	1.8952	141.389
30	02:42:48.780	2.71355	155500	694.02	-0.594	4.6137	-57.586
31	02:42:48.780	2.71355	155500	694.02	-0.569	4.483	-57.586
32	02:42:48.812	2.713559	155500	694.02	-0.568	4.3999	55.32
33	02:42:48.812	2.713559	155500	694.02	-0.558	4.5428	55.32
34	02:42:48.938	2.713594	155500	694.02	-0.562	6.1023	144.713
35	02:42:48.938	2.713594	155500	694.02	-0.553	6.4969	144.713
36	02:42:48.985	2.713607	155500	694.02	-0.544	6.3456	-48.344
37	02:42:48.985	2.713607	155500	694.02	-0.551	5.8435	-48.344
38	02:42:49.108	2.713641	155500	694.02	-0.537	7.0211	33.793
39	02:42:49.108	2.713641	155500	694.02	-0.522	7.5585	33.793
40	02:42:49.140	2.71365	155500	694.02	-0.536	6.3099	-1.731
41	02:42:49.140	2.71365	155500	694.02	-0.532	7.0082	-1.731
42	02:42:49.266	2.713685	155500	694.02	-0.533	7.3644	-2.212
43	02:42:49.266	2.713685	155500	694.02	-0.533	6.3644	-2.212
44	02:42:49.313	2.713698	155500	692.521	-0.537	5.3543	35.436
45	02:42:49.313	2.713698	155500	694.02	-0.524	6.0193	35.436
46	02:42:49.435	2.713732	155500	694.02	-0.526	5.5214	-93.851
47	02:42:49.435	2.713732	155500	692.521	-0.541	4.8299	-93.851
48	02:42:49.468	2.713741	155500	694.02	-0.52	3.8855	-41.643
49	02:42:49.468	2.713741	155500	692.521	-0.515	4.5121	-41.643
50	02:42:59.468	2.716519	155500	688.024	0.142	1.659	41.76
51	02:42:59.641	2.716567	155500	689.523	0.296	1.625	22.421
52	02:43:00.404	2.716779	155500	689.523	0.276	1.3469	153.473
53	02:43:00.455	2.716793	155500	697.017	0.567	0.7285	169.544
54	02:43:01.920	2.7172	155500	689.523	0.304	2.0544	1.266
55	02:43:02.046	2.717235	155500	689.523	0.227	2.3106	-28.037
56	02:43:02.093	2.717248	155500	688.024	0.38	2.293	61.474
57	02:43:02.093	2.717248	155500	689.523	0.07	0.8654	61.474
58	02:43:02.219	2.717283	155500	689.523	0.233	1.9813	-64.983
59	02:43:02.219	2.717283	155500	689.523	0.427	0.919	-64.983
60	02:43:02.251	2.717292	155500	689.523	0.344	1.5472	33.531
61	02:43:02.251	2.717292	155500	700.015	0.118	0.9852	33.531
62	02:43:02.374	2.717326	155500	688.024	0.242	1.2803	-93.675
63	02:43:02.420	2.717339	155500	706.011	0.29	0.9827	102.877
64	02:43:02.752	2.717431	155500	688.024	0.41	1.2707	-52.603
65	02:43:02.874	2.717465	155500	688.024	0.477	2.3565	-90.965
66	02:43:02.874	2.717465	155500	688.024	0.351	0.9026	-90.965
67	02:43:02.906	2.717474	155500	688.024	0.394	2.3844	90.726
68	02:43:02.906	2.717474	155500	688.024	0.22	0.707	90.726
69	02:43:03.032	2.717509	155500	692.521	0.454	2.2	-77.341
70	02:43:03.079	2.717522	155500	691.022	0.454	1.9971	-134.462
71	02:43:03.079	2.717522	155500	695.519	0.418	0.7085	-134.462
72	02:43:03.234	2.717565	155500	694.02	0.462	1.1628	150.816
73	02:43:03.234	2.717565	155500	698.516	0.432	1.583	150.816
74	02:43:03.562	2.717656	155500	689.523	0.442	2.8181	101.86
75	02:43:03.562	2.717656	155500	694.02	0.494	0.8737	101.86
76	02:43:03.688	2.717691	155500	689.523	0.471	5.6829	62.693
77	02:43:03.688	2.717691	155500	688.024	0.384	1.3825	62.693
78	02:43:03.734	2.717704	155500	689.523	0.481	5.5211	-60.122
79	02:43:03.734	2.717704	155500	697.017	0.526	1.1521	-60.122
80	02:43:03.860	2.717739	155500	691.022	0.486	5.5526	40.499
81	02:43:03.889	2.717747	155500	689.523	0.5	1.3723	11.202
82	02:43:03.889	2.717747	155500	689.523	0.504	5.234	11.202
83	02:43:04.015	2.717782	155500	689.523	0.438	4.5858	-84.693
84	02:43:04.015	2.717782	155500	691.022	0.472	2.6186	-84.693
85	02:43:04.062	2.717795	155500	688.024	0.499	4.4725	116.052
86	02:43:04.062	2.717795	155500	688.024	0.509	2.6255	116.052
87	02:43:04.170	2.717825	155500	691.022	0.489	3.8432	114.214
88	02:43:04.170	2.717825	155800	689.523	0.618	1	-90
89	02:43:04.170	2.717825	155500	691.022	0.523	2.6986	114.214
90	02:43:04.217	2.717838	155500	689.523	0.515	2.5717	-10.805
91	02:43:04.217	2.717838	155500	689.523	0.48	4.1222	-10.805
92	02:43:04.343	2.717873	155500	688.024	0.403	2.1953	-130.023
93	02:43:04.343	2.717873	155500	689.523	0.564	0.8946	-130.023
94	02:43:04.390	2.717886	155500	688.024	0.507	1.9789	-136.485
95	02:43:04.390	2.717886	155500	689.523	0.418	1.3348	-136.485
96	02:43:04.501	2.717917	155500	689.523	0.457	5.6326	-30.77
97	02:43:04.501	2.717917	155800	689.523	0.28	1.0979	-90
98	02:43:04.501	2.717917	155500	691.022	0.469	2.4779	-30.77
99	02:43:04.544	2.717929	155500	688.024	0.543	2.7256	-19.826
100	02:43:04.544	2.717929	155500	689.523	0.542	7.3361	-19.826
101	02:43:04.670	2.717964	155500	691.022	0.526	8.3022	137.232
102	02:43:04.670	2.717964	155800	689.523	0.423	1.4672	-90
103	02:43:04.670	2.717964	155500	689.523	0.587	2.3963	137.232
104	02:43:04.717	2.717977	155500	689.523	0.556	8.0613	30.8
105	02:43:04.717	2.717977	155500	689.523	0.632	2.0695	30.8
106	02:43:04.829	2.718008	155500	688.024	0.544	8.1962	-6.292
107	02:43:04.829	2.718008	155500	689.523	0.63	3.6894	-6.292
108	02:43:04.876	2.718021	155500	691.022	0.552	4.8576	92.782
109	02:43:04.876	2.718021	155500	689.523	0.56	8.9956	92.782
110	02:43:04.998	2.718055	155500	689.523	0.546	14.0886	-174.455
111	02:43:04.998	2.718055	155800	690.122	0.415	0.8467	-90
112	02:43:04.998	2.718055	155500	691.022	0.555	8.0619	-174.455
113	02:43:05.045	2.718068	155500	689.523	0.567	13.9764	102.742
114	02:43:05.045	2.718068	155500	689.523	0.55	7.9772	102.742
115	02:43:05.156	2.718099	155800	690.122	0.538	0.7406	-90
116	02:43:05.156	2.718099	155500	689.523	0.534	6.6867	-37.978
117	02:43:05.156	2.718099	155800	690.122	1.163	0.9235	-90
118	02:43:05.156	2.718099	155500	689.523	0.545	14.2688	-37.978
119	02:43:05.203	2.718112	155500	689.523	0.534	17.1703	59.596
120	02:43:05.203	2.718112	155500	689.523	0.558	8.6993	59.596
121	02:43:05.329	2.718147	155500	691.022	0.573	21.3975	87.22
122	02:43:05.329	2.718147	155800	690.122	0.948	1.2584	-90
123	02:43:05.329	2.718147	155500	691.022	0.571	39.9835	87.22
124	02:43:05.376	2.71816	155500	691.022	0.573	57.7979	169.812
125	02:43:05.376	2.71816	155500	691.022	0.572	28.287	169.812
126	02:43:05.484	2.71819	155800	690.122	0.619	0.8395	-90
127	02:43:05.484	2.71819	155500	691.022	0.607	38.3317	14.494
128	02:43:05.484	2.71819	155800	690.122	0.613	1.2236	-90
129	02:43:05.484	2.71819	155500	691.022	0.607	68.1415	14.494
130	02:43:05.531	2.718203	155500	691.022	0.604	91.8772	-70.111
131	02:43:05.531	2.718203	155500	691.022	0.606	42.5223	-70.111
132	02:43:05.657	2.718238	155500	691.022	0.606	46.1794	82.585
133	02:43:05.657	2.718238	155500	691.022	0.602	87.951	82.585
134	02:43:05.686	2.718246	155500	691.022	0.601	108.6002	-39.095
135	02:43:05.686	2.718246	155500	691.022	0.602	50.1792	-39.095
136	02:43:05.812	2.718281	155800	690.122	-0.184	0.8074	-90
137	02:43:05.812	2.718281	155500	691.022	0.605	52.5729	5.747
138	02:43:05.812	2.718281	155800	690.722	0.636	0.8956	-90
139	02:43:05.812	2.718281	155500	691.022	0.605	104.1551	5.747
140	02:43:05.858	2.718294	155500	691.022	0.619	112.2539	52.656
141	02:43:05.858	2.718294	155500	691.022	0.617	47.0404	52.656
142	02:43:05.984	2.718329	155800	691.321	0.686	1.5584	-90
143	02:43:05.984	2.718329	155500	691.022	0.621	38.4407	-80.393
144	02:43:05.984	2.718329	155800	690.122	0.108	1.164	-90
145	02:43:05.984	2.718329	155500	691.022	0.622	102.2105	-80.393
146	02:43:06.017	2.718338	155500	691.022	0.635	97.0626	11.579
147	02:43:06.017	2.718338	155500	691.022	0.634	35.7971	11.579
148	02:43:06.139	2.718372	155500	691.022	0.628	79.5383	-105.527
149	02:43:06.139	2.718372	155800	690.722	0.842	1.7117	-90
150	02:43:06.139	2.718372	155500	691.022	0.63	25.8476	-105.527
151	02:43:06.186	2.718385	155500	691.022	0.639	21.4302	-72.598
152	02:43:06.186	2.718385	155500	691.022	0.64	72.8549	-72.598
153	02:43:06.312	2.71842	155500	691.022	0.654	48.7105	-100.966
154	02:43:06.312	2.71842	155800	690.722	0.76	2.7845	-90
155	02:43:06.312	2.71842	155500	691.022	0.65	12.3197	-100.966
156	02:43:06.312	2.71842	155800	690.722	0.615	1.6231	-90
157	02:43:06.344	2.718429	155500	691.022	0.656	36.7469	-145.716
158	02:43:06.344	2.718429	155500	691.022	0.657	9.5395	-145.716
159	02:43:06.467	2.718463	155800	690.722	1.002	1.3696	-90
160	02:43:06.467	2.718463	155500	691.022	0.627	4.9613	108.12
161	02:43:06.467	2.718463	155800	690.722	0.78	3.576	-90
162	02:43:06.467	2.718463	155500	691.022	0.654	19.1054	108.12
163	02:43:06.514	2.718476	155500	691.022	0.66	15.8038	-33.718
164	02:43:06.514	2.718476	155500	691.022	0.647	4.3561	-33.718
165	02:43:06.640	2.718511	155500	691.022	0.67	11.916	-158.391
166	02:43:06.640	2.718511	155800	690.722	0.71	4.3484	-90
167	02:43:06.640	2.718511	155500	692.521	0.676	4.0753	-158.391
168	02:43:06.640	2.718511	155800	690.722	1.287	1.7809	-90
169	02:43:06.672	2.71852	155500	691.022	0.704	4.1508	12.301
170	02:43:06.672	2.71852	155500	691.022	0.694	12.3001	12.301
171	02:43:06.794	2.718554	155500	691.022	0.665	14.8526	30.138
172	02:43:06.794	2.718554	155800	690.722	0.631	6.4855	-90
173	02:43:06.794	2.718554	155500	691.022	0.627	4.6233	30.138
174	02:43:06.794	2.718554	155800	691.321	0.462	3.8964	-90
175	02:43:06.845	2.718568	155500	691.022	0.692	16.3359	51.573
176	02:43:06.845	2.718568	155500	692.521	0.685	4.8758	51.573
177	02:43:06.967	2.718602	155800	691.921	0.893	8.4	-90
178	02:43:06.967	2.718602	155500	692.521	0.718	4.4474	-109.829
179	02:43:06.967	2.718602	155800	691.321	0.765	14.468	-90
180	02:43:06.967	2.718602	155500	692.521	0.679	17.353	-109.829
181	02:43:06.1000	2.718611	155500	692.521	0.697	17.806	67.63
182	02:43:06.1000	2.718611	155500	691.022	0.693	3.8142	67.63
183	02:43:07.126	2.718646	155500	692.521	0.684	15.3968	-105.265
184	02:43:07.126	2.718646	155800	691.921	0.818	31.6487	-90
185	02:43:07.126	2.718646	155500	692.521	0.686	3.1441	-105.265
186	02:43:07.126	2.718646	155800	691.921	0.816	16.7534	-90
187	02:43:07.172	2.718659	155500	691.022	0.737	2.5524	-39.778
188	02:43:07.172	2.718659	155500	691.022	0.724	12.8181	-39.778
189	02:43:07.295	2.718693	155500	692.521	0.716	7.0312	116.615
190	02:43:07.295	2.718693	155800	691.921	0.747	45.6562	-90
191	02:43:07.295	2.718693	155500	697.017	0.853	1.7701	116.615
192	02:43:07.295	2.718693	155800	692.521	0.867	23.0872	-90
193	02:43:07.327	2.718702	155500	689.523	0.575	1.8056	24.646
194	02:43:07.327	2.718702	155800	686.825	0.841	10.1139	-90
195	02:43:07.327	2.718702	155500	691.022	0.719	6.1006	24.646
196	02:43:07.453	2.718737	155800	692.521	0.846	28.977	-90
197	02:43:07.453	2.718737	155500	695.519	0.697	1.3341	51.379
198	02:43:07.453	2.718737	155800	692.521	0.809	60.995	-90
199	02:43:07.453	2.718737	155500	689.523	0.706	2.6353	51.379
200	02:43:07.500	2.71875	155500	689.523	0.706	2.405	42.444
201	02:43:07.500	2.71875	155500	692.521	0.728	1.0625	42.444
202	02:43:07.626	2.718785	155500	689.523	0.705	2.3215	169.739
203	02:43:07.626	2.718785	155800	692.521	0.778	70.1725	-90
204	02:43:07.626	2.718785	155500	691.022	0.815	0.8477	169.739
205	02:43:07.626	2.718785	155800	692.521	0.792	31.4514	-90
206	02:43:07.655	2.718793	155500	695.519	0.585	1.0045	106.277
207	02:43:07.655	2.718793	155500	691.022	0.771	2.5238	106.277
208	02:43:07.781	2.718828	155500	691.022	0.802	2.9804	59.901
209	02:43:07.781	2.718828	155800	692.521	0.735	64.1852	-90
210	02:43:07.781	2.718828	155500	691.022	0.648	1.3011	59.901
211	02:43:07.781	2.718828	155800	692.521	0.802	24.1704	-90
212	02:43:07.828	2.718841	155500	692.521	0.761	4.2909	-112.539
213	02:43:07.828	2.718841	155500	697.017	0.8	0.9158	-112.539
214	02:43:07.954	2.718876	155800	692.521	0.886	18.9561	-90
215	02:43:07.954	2.718876	155500	700.015	0.776	1.1238	79.834
216	02:43:07.954	2.718876	155800	692.521	0.79	55.3845	-90
217	02:43:07.954	2.718876	155500	691.022	0.746	4.7256	79.834
218	02:43:07.982	2.718884	155500	694.02	0.753	4.482	120.017
219	02:43:07.982	2.718884	155500	691.022	0.702	0.948	120.017
220	02:43:08.108	2.718919	155500	695.519	0.797	2.6005	43.776
221	02:43:08.108	2.718919	155800	692.521	0.75	35.7133	-90
222	02:43:08.108	2.718919	155500	691.022	0.978	1.0495	43.776
223	02:43:08.108	2.718919	155800	692.521	0.935	10.2453	-90
224	02:43:08.155	2.718932	155500	695.519	0.78	2.4838	82.903
225	02:43:08.641	2.719067	155500	692.521	0.753	1.4518	-18.172
226	02:43:08.641	2.719067	155500	692.521	0.904	0.6961	-18.172
227	02:43:08.764	2.719101	155500	694.02	0.838	2.0568	-76.12
228	02:43:08.764	2.719101	155800	693.12	0.842	8.3729	-90
229	02:43:08.764	2.719101	155800	693.12	0.635	2.3927	-90
230	02:43:08.814	2.719115	155500	692.521	0.797	2.2101	-116.162
231	02:43:29.658	2.724905	159300	726.097	2.216	0.7118	-50.675
232	02:43:29.658	2.724905	159000	725.498	2.125	2.0207	52.035
233	02:43:29.658	2.724905	159000	723.999	2.146	2.1807	52.035
234	02:43:29.701	2.724917	159000	725.498	2.231	2.7326	-164.348
235	02:43:29.701	2.724917	159000	725.498	2.153	2.4601	-164.348
236	02:43:29.827	2.724952	159000	726.997	2.2	5.2328	147.276
237	02:43:29.827	2.724952	159000	726.997	2.23	3.4178	147.276
238	02:43:29.860	2.724961	159000	725.498	2.213	4.2615	-115.474
239	02:43:29.860	2.724961	159000	726.997	2.221	5.9613	-115.474
240	02:43:29.986	2.724996	159000	726.997	2.188	8.9551	56.894
241	02:43:29.986	2.724996	159000	728.496	2.176	5.3017	56.894
242	02:43:30.032	2.725009	159000	726.997	2.222	6.1273	-132.001
243	02:43:30.032	2.725009	159000	726.997	2.194	10.33	-132.001
244	02:43:30.155	2.725043	159000	728.496	2.224	12.4124	25.019
245	02:43:30.155	2.725043	159000	726.997	2.19	7.1642	25.019
246	02:43:30.187	2.725052	159000	726.997	2.219	12.9369	70.994
247	02:43:30.187	2.725052	159000	726.997	2.211	7.0763	70.994
248	02:43:30.313	2.725087	159000	728.496	2.207	15.4004	-28.543
249	02:43:30.313	2.725087	159000	726.997	2.216	7.7801	-28.543
250	02:43:30.360	2.7251	159000	728.496	2.225	8.2739	-7.574
251	02:43:30.360	2.7251	159000	726.997	2.202	16.4984	-7.574
252	02:43:30.482	2.725134	159000	728.496	2.207	15.9722	-25.025
253	02:43:30.482	2.725134	159000	728.496	2.248	8.0714	-25.025
254	02:43:30.515	2.725143	159000	728.496	2.223	15.8194	68.162
255	02:43:30.515	2.725143	159000	726.997	2.209	7.8706	68.162
256	02:43:30.641	2.725178	159000	728.496	2.196	6.5377	90.845
257	02:43:30.641	2.725178	159000	728.496	2.214	13.9091	90.845
258	02:43:30.688	2.725191	159000	728.496	2.228	14.5196	95.518
259	02:43:30.688	2.725191	159000	728.496	2.207	6.1443	95.518
260	02:43:30.810	2.725225	159000	728.496	2.239	5.0152	-44.281
261	02:43:30.810	2.725225	159000	729.995	2.212	11.7971	-44.281
262	02:43:30.842	2.725234	159000	728.496	2.235	11.2595	86.322
263	02:43:30.842	2.725234	159000	728.496	2.226	5.3853	86.322
264	02:43:30.968	2.725269	159000	728.496	2.227	7.3185	-115.649
265	02:43:30.968	2.725269	159000	728.496	2.189	2.7729	-115.649
266	02:43:31.015	2.725282	159000	728.496	2.26	6.7792	58.524
267	02:43:31.015	2.725282	159000	731.494	2.271	2.5014	58.524
268	02:43:31.123	2.725312	159000	729.995	2.145	1.704	34.462
269	02:43:31.123	2.725312	159000	729.995	2.277	4.284	34.462
270	02:43:31.170	2.725325	159000	729.995	2.183	3.4188	35.432
271	02:43:31.170	2.725325	159000	732.993	2.279	1.6127	35.432
272	02:43:31.296	2.72536	159000	732.993	2.262	1.9916	-111.706
273	02:43:31.296	2.72536	159300	729.095	2.311	0.7488	-90
274	02:43:31.296	2.72536	159000	728.496	2.299	1.1805	-111.706
275	02:43:31.343	2.725373	159000	725.498	2.207	1.6807	-2.233
276	02:43:31.343	2.725373	159000	732.993	2.222	0.9499	-2.233
277	02:43:31.454	2.725404	159000	726.997	2.386	1.5096	140.674
278	02:43:31.501	2.725417	159000	728.496	2.165	1.3409	-24.83
279	02:43:31.670	2.725464	159000	728.496	2.222	1.5845	70.312
280	02:43:31.782	2.725495	159000	728.496	2.277	1.878	146.546
281	02:43:31.829	2.725508	159000	732.993	2.349	1.8102	86.06
282	02:43:31.829	2.725508	159000	731.494	2.269	0.6782	86.06
283	02:43:32.002	2.725556	159000	729.995	2.268	2.1288	-71.418
284	02:43:32.156	2.725599	159000	731.494	2.311	1.4289	10.327

Registered SO during ionospheric observations

Author: Denis Makogon.