Units of sigma and epsilon

[Raghvendra Singh]

Dear EspressoMD users,

I have been trying some examples from espressmd sample directory and would like 
to know what are the units of sigma and epsilon in the visualization_charged.py 
script for colloids.
I am planning to run simulations on large colloidal particle of diameters 
ranging from 100-500nm.
if someone can provide me details regarding the unit system used in the 
visualization_charged.py then I can adapt to the unit system with parameters 
for large colloidal particles.

if someone can help me out regarding parametrization of large colloidal 
particle (not the raspberry model but simple point particle of LJ-kind).

Thanking you

Best
Raghav