Packet Size - Variable
| IDN | Description |
| 11 | atom 1 label |
| 12-14 | atom 1 fractional coords x,y,z |
| 15 | atom 1 symop number |
| 16 | atom 1 packed cell translations for origin at 555 |
| 21 | atom 2 label |
| 22-24 | atom 2 fractional coords x,y,z |
| 25 | atom 2 symop number |
| 26 | atom 2 packed cell translations for origin at 555 |
| 91 | calculated rigid link |
| 92 | esd of calculated rigid link |
| 93 | observed rigid link (O) |
| 94 | variance of observed rigid link |
| 95 | rigid link weight |
| 101-112 | atom 1 symmetry elements r11 r21 r31 r12 r22 r23 r31 r32 r33 t1 t2 t3 |
| 201-212 | atom 2 symmetry elements |