The DDE file contains information about the logarithmic derivatives of the AE (i.e. exact) wavefunctions
and the pseudowavefunctions.
The DDE file is written by the fourpot3 program.
The first line contains a comment, the second line the number of energies 
for which the logarithmic derivatives were calculated.
After the line
Core Pot L = .00000 -.34032
data pairs follow. The first control line ("Core Pot ...")
contains the l-quantum number and
the reference energy in Rydberg.
The first value of each data pair, following the control line,
supplies the energy, the second value the logarithmic derivative of the
AE l-wavefunction.
Information about the non-separable pseudopotential follows after the line
Potential L = .00000 -.34032information about the factorized Kleinman-Bylander or ultrasoft pseudopotential is printed after the lines
KBPotential L = 4.00000 .00000A program for plotting the data points exists. This program is called
drawddeand requires erlgraph. No support for erlgraph will be given by our institute so do not ask for support. If you want to make plots you can copy the program and change it to use your own plot routines.