This is a formatted file containing the Z-density data. Its contents are as follows:
record 1
cfgname character (A80) configuration name
record 2
mxrdf integer (i10) number of data points in theZ-density function
following records (mxrdf records)
z real (e14) distance in z direction (A)
real (e14) Z-density at given height z
Note the ZDNDAT file is optional and appears when the print rdf option is specified in the CONTROL file.