This procedure produces Figure
, a period
versus period derivative diagram for pulsars. Note the use of a
column within the data file to set the symbol number of each plotted
point, and the use of the PONGO_NDATA global parameter for
making a title containing the number of points that have been read in
(in CL this uses the output parameter readf.ndata)
PONGO [2exof Applications for Interactive Data Plotting [2exon 2.0-2