P3
# feep.p3.hidepth.master.ppm
4 4
7919 # prime number chosen for test purposes
 0   0  0    0  0    0    0  0    0    7919 0 7919
 0   0  0    0 7919 3695  0  0    0     0   0  0
 0   0  0    0  0    0    0 7919 3695   0   0  0
7919 0 7919  0  0    0    0  0    0     0   0  0