Snapshot:What do the xs, ys, zs,xf,yf,zf,mean

[HIT-flower]

Hi everyone,

Can anyone tell me how to use Snapshot？I can't figure out what do the xs, ys, zs,xf,yf,zf,mean.

TIP:

You can take advantage of Python scripting to easily create a series of snapshots. For example, to create 30 snapshots starting at time 0.1ns until 3ns in intervals of 0.1ns, use the following code snippet in your input file. Replace xs, ys, zs, xf, yf, zf, dx, dy, dz accordingly.

#python:
from gprMax.input_cmd_funcs import *
for i in range(1, 31):
    snapshot(xs, ys, zs, xf, yf, zf, dx, dy, dz, (i/10)*1e-9, 'snapshot' + str(i))
#end_python: