Looking at a copy of GC_SPC.EXT I have: it unnecessarily runs past column 72: the DATA lines all have DATA followed by 10 blanks, of which 9 are unnecessary. Use your favorite method to replace that 14-character sequence by the 5-character sequence "DATA " – your favorite text editor will do it, or you can use command-line utility sed:
cat GC_SPC.EXT | sed -e ‘s/DATA /DATA /’ > GC_SPC.EXT.good
mv -f GC_SPC.EXT.good GC_SPC.EXT
For my GC_SPC.EXT, that yields a file that goes only to column 69.
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