Plan 9 from User Space /usr/local/plan9/src/cmd/plot

d-rwxr-xr-x M 0  glenda sys     0 Mar 23 20:59 libplot/
--rw-r--r-- M 0  glenda sys   265 Mar 23 20:59 mkfile
--rw-r--r-- M 0  glenda sys 12057 Mar 23 20:59 plot.c
--rw-r--r-- M 0  glenda sys  1002 Mar 23 20:59 plot.h