is the hartree_difference_potential flat?

[njuxyh]

Hi ATK support:
I tried to plot the Hartree difference potential to check the central region is enough long or not,
the plot is in the attachment.
but I do not know it is flat or not?, because I set the Y axis is from -1 to 1 eV. when I set Y -0.06 to  0.12 eV , it seems not flat.
so my question is how to set Y axis region when I check the length of  central region.
 

[mlee]

Please see the linked tutorial which is shown using the electrostatic difference potential according to the different doping levels.
https://docs.quantumwise.com/tutorials/nisi2-si/nisi2-si.html