The routine merges the bad-pixel flag values of an array component (or components) for a pair of NDFs, returning the logical "OR" of the separate values for each NDF. In addition, if bad pixels are found to be present in either NDF but the application indicates that it cannot correctly handle such values, then an error to this effect is reported and a STATUS value is set.

CALL NDF_MBAD( BADOK, INDF1, INDF2, COMP, CHECK, BAD, STATUS )

BADOK = LOGICAL (Given)

INDF1 = INTEGER (Given)

INDF2 = INTEGER (Given)

COMP = CHARACTER $\ast$ ( $\ast$ ) (Given)

CHECK = LOGICAL (Given)

BAD = LOGICAL (Returned)

STATUS = INTEGER (Given and Returned)

• A comma-separated list of component names may also be supplied, in which case the routine will take the logical "OR" of all the specified components when calculating the combined bad-pixel flag value.

• The effective value of the bad-pixel flag for each NDF array component which this routine uses is the same as would be returned by a call to the routine NDF_BAD.

• If this routine detects the presence of bad pixels which the application cannot support (as indicated by a .FALSE. value for the BADOK argument), then an error will be reported to this effect and a STATUS value of NDF__BADNS (bad pixels not supported) will be returned. The value of the BAD argument will be set to .TRUE. under these circumstances. The NDF__BADNS constant is defined in the include file NDF_ERR.