strip part of string

[Francesco Pietra]

Hi:
I would like to delete everything from column 54 on for each line
beginning with "ATOM". In the example in the attachment (sorry for the
attachment; I found no way with Google mail to have plain text mail)
the new line would become:

ATOM     49  NH1 ARG    84      84.628  41.570  44.395

without any blank space to the right. . Everything else should remain
at its original column. I have been looking for ???? statement, unable
(my big fault ) to find a right one. I tried with slices % but it
becomes unnecessarily complex.


Thanks
francesco
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