If no files are given, psxy z will read standard input. Selects the map projection. More details can be found in the psbasemap manpages. Same syntax as -Jx . No space between the option flag and the associated argu- ments.
Sets map boundary tickmark intervals.
See psbasemap for details. Give a color palette file and let symbol color be determined by the t-value in the fourth column. Must be used with -S . Number of header records can be changed by editing your . gmtdefaults file. If used, GMT default is 1 header record.