echo "computing max count in ${hist_file} ..." 1>&2 
  ct_max=$( cat ${hist_file} | gawk -v max=0 '/^ *[0-9]/{ if ($2+0 > max) { max = $2} } END { print max }' )
  printf "${hist_name}:\n" 1>&2
  printf "  %7d max units per parag\n" "${ct_max}" 1>&2
  ct_maxs+=( ${ct_max} )

text-files: 
	for vm_ecorr in 0 1; do \
	  make VM_ECORR=$${vm_ecorr} VM_SIMIL=$${vm_simil} single-vm-text ; \
	done
	for ch_tones in 0 1; do \
	  for ch_noise in ${CH_NOISES}; do \
	    make CH_TONES=$${ch_tones} CH_NOISE=$${ch_noise} single-ch-text ; \
	  done; \
	done