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my $zmax = 60;    # Maximum depth in your model
my $dz = 0.05;    # Grid spacing in z-direction
...
for (my $i=0; $i <= $zmax; $i = $i+$dz) {
   print $i."\n";
}

3.6
3.65
3.69999999999999
3.74999999999999