Hello, I was wondering if it is possible to tile multiple volume series such that one can have 2-3 series playing side by side?

If so could you suggest the syntax for the tile command I cannot seem to get it right?  I have the two vseries loaded as #1 and #2 (and each series has 10 sub volumes).

I have tried variations of

tile #1,2 columns  2 spacingFactor 1

and get errors like this:

Traceback (most recent call last):
  File "/opt/UCSF/ChimeraX-daily/lib/python3.7/site-packages/chimerax/cmd_line/tool.py", line 258, in execute
    cmd.run(cmd_text)
  File "/opt/UCSF/ChimeraX-daily/lib/python3.7/site-packages/chimerax/core/commands/cli.py", line 2837, in run
    result = ci.function(session, **kw_args)
  File "/opt/UCSF/ChimeraX-daily/lib/python3.7/site-packages/chimerax/std_commands/tile.py", line 27, in tile
    spacing = max([m.bounds().radius() for m in models]) * spacing_factor
  File "/opt/UCSF/ChimeraX-daily/lib/python3.7/site-packages/chimerax/std_commands/tile.py", line 27, in <listcomp>
    spacing = max([m.bounds().radius() for m in models]) * spacing_factor
AttributeError: 'NoneType' object has no attribute 'radius'

AttributeError: 'NoneType' object has no attribute 'radius'

File "/opt/UCSF/ChimeraX-daily/lib/python3.7/site-packages/chimerax/std_commands/tile.py", line 27, in
spacing = max([m.bounds().radius() for m in models]) * spacing_factor

Thanks in advance for any suggestions you have.

sean