read_data running
input: 25 25 
nxx=25
nyy=25
about to allocate 1878 doubles
first x=-1.0, y=-1.0, z=-0.858216
read_data finished, n_input=625
xmin=-1.0, xmax=1.0, last=1.0
ymin=-1.0, ymax=1.0, last=1.0
zmin=-1.0, zmax=1.0, last=-0.858216