When the time comes to generate the table, you have two more controls:
By default, both are off (i.e., if you do nothing, neither will appear).
The command
nawk -f epp2tex.nawk putt=1 demo.epp > table.tex
will read the input in ``demo.epp'' and generate table.tex, where t-statistics are also computed and displayed.
The command
nawk -f epp2tex.nawk putt=1 putfree=1 demo.epp > table.tex
will read the input in ``demo.epp'' and generate table.tex, where t-statistics are computed+displayed and the ``free'' status for each parameter is shown.
Using defaults, the command
nawk -f epp2tex.nawk demo.epp > table.tex
will typeset the table without showing ``free'' and t-statistics.
The syntax for initialising variables on the commandline is slightly different depending on whether you're using gawk or nawk. Thus instead of saying
nawk -f epp2tex.nawk putt=1 demo.epp
you would say
gawk -f epp2tex.nawk -v putt=1 demo.epp