Table 1.
Number of records and groups in the databases.
| Name | Number of | Number of groups | ||
|---|---|---|---|---|
| records | |G0| | |G1| | |G3| | |
| RGO | 161 413 | 29 800 | 25 565 | 18 597 |
| SOON | 80 106 | 10 664 | 9938 | 6870 |
| PCSA | 115 925 | 18 094 | 15 523 | 13 755 |
| KMAS | 115 003 | 19 162 | 17 076 | 12 385 |
Notes. The table presents the number of records and number of all groups G0, and of groups G1 and G3 remaining after sorting out the groups with maximal area observed at the right and left visibility frontier; the ipf φ0, φ1, and φ3 will be constructed with the sets G0, G1, and G3 respectively; definitions of which are in Sects. 2 and 3.
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