# Limits of periodic box from pdb

I have a pdb file of some solvent molecules in a box of 20 Angstroms I have built using Tinker. I have opened the file with Chimera, Molden, Pymol and Avogadro... but I would like to see, and maybe generate a figure with, the proper limits of the box if there is any tool for doing so.

Has anyone succeded before? I do not mind getting used to another visualization program or tool.

In pymol the cell can be displayed by typing show cell into the command line.
pip install --user ase