| line | !l | l&&!r | l&&r | condition | 
 
| 129 | 0 | 0 | 1 | exists $FITS_headers->{'CHOPBEAM'} and $FITS_headers->{'CHOPBEAM'} =~ /^B/ | 
 
|  | 0 | 0 | 1 | exists $FITS_headers->{'CHOPBEAM'} and $FITS_headers->{'CHOPBEAM'} =~ /^B/ and exists $FITS_headers->{'CHPANGLE'} | 
 
|  | 0 | 0 | 1 | exists $FITS_headers->{'CHOPBEAM'} and $FITS_headers->{'CHOPBEAM'} =~ /^B/ and exists $FITS_headers->{'CHPANGLE'} and exists $FITS_headers->{'CHPTHROW'} | 
 
| 209 | 0 | 0 | 1 | defined $noff and $noff =~ /\d+/ | 
 
| 257 | 0 | 0 | 0 | exists $FITS_headers->{'CHOPBEAM'} and $FITS_headers->{'CHOPBEAM'} =~ /^B/ | 
 
|  | 0 | 0 | 0 | exists $FITS_headers->{'CHOPBEAM'} and $FITS_headers->{'CHOPBEAM'} =~ /^B/ and exists $FITS_headers->{'CHPANGLE'} | 
 
|  | 0 | 0 | 0 | exists $FITS_headers->{'CHOPBEAM'} and $FITS_headers->{'CHOPBEAM'} =~ /^B/ and exists $FITS_headers->{'CHPANGLE'} and exists $FITS_headers->{'CHPTHROW'} | 
 
| 308 | 0 | 0 | 1 | exists $FITS_headers->{'RDOUT_X1'} and exists $FITS_headers->{'RDOUT_X2'} | 
 
| 344 | 0 | 0 | 1 | exists $FITS_headers->{'RDOUT_Y1'} and exists $FITS_headers->{'RDOUT_Y2'} |