Styling options for the line representation. Used inside
m_add_style() and m_set_style(). Can also be used for styling
when adding individual lines with m_add_line().
Specify scheme to color the atoms by. Default is
"default". Other choies are "Carbon", ssPyMOL", "ssJmol", "Jmol",
"default", "amino",
"shapely", "nucleic", "chain", "chainHetatm", "prop".
color
Fixed coloring, overrides colorScheme.
opacity
Opacity, must be the same for all atoms in the model.