Meaning of the flags in the "fl" column

Option: 0 (0=show all flags, x=hexadecimal)

|1   |one of the coordinates had an excessively large χ²  |
|2   |row from PPMX (Cat. I/312) [if set, magnitudes b1, b2, r1, r2, i have a special meaning] |
|4   |row from PPMX (Cat. I/312) (replaces a single USNO-B object) |
|8   |row replaces multiple USNO-B1.0 objects  |