# pre:filter  line 18 is this:
#  my $section =  $gal(337:357, 178:198 );
#    imag $section; # It's the bright star

# post filter line 18 is this, and runs without "use PDL::Nice::Slice"
my $section =  $gal->nslice([337,357,1],[178,198,1]);
 imag $section; # It's the bright star