Bugs in passcal package.
Bugs in SAC (Seismic Analysis Code).
Since the codes of SAC are not open, there are not bug-fixed solutions.
Sac program has never to release memory after a file is read. For example, when
you repeat to read a file for many times, the SAC will crash when total memory
is exhausted. There is no solution unless you close the program.
In Linux, all graph colors in Xwindows(X11) are black, but the colors in sgf
file (which can be converted to ps file) are correct.