File Format cnt
Contour file. This is a binary file. The file format is:
 - Record 1: nx ny title
  nx is the number of gridpoints horizontal,
  ny is the number is gridpoints vertical. The title is optional.
  - Record 2: nx datapoints(floating point) for iy=1
 
 - Record 3: nx datapoints for iy=2
 
 - Record ny+1: nx datapoints for iy=ny
 
More maps may follow the first one.
programs
An alphabetical list of programs reading/creating cnt files:
 - cnt2ccp4
  Converts a cnt file into a CCP4 density map
  - eval15
  writes slices to a cnt file:
  cntwrite
  - imagesum
  Reads and manipulates images. Can write cnt files
  write
  - mergecnt
  merges cnt files
  - slicecnt
  Converts an eval15 slice file
  into a cnt file.
  - view