style
Controls how the bond is shown: with cylinders in 
solid mode 
and with simple lines in 
wired mode. By default, the 
wired
mode is used. To change the default read 
Help->Topics->Formats->Bond->Config.
Example: <bond ... style="wired"/> (default)
Allowed values: wired, solid (optional)
size
In 
solid mode, controls the size of the bond cylinders. 
Combining bond 
size with atom 
variancy and 
size, 
it is possible to obtain a wide range of styles to represent atomic 
structures. The default is to represent atoms slightly larger than bonds:
<atom ... variancy="0.0" size="0.8"/><bond ... size="0.5"/>
An elegant style is to represent bonds with the same size as atoms:
<atom ... variancy="0.0" size="0.5"/><bond ... size="0.5"/>
To guarantee that bond cylinders are closed by atom spheres,
bond 
size should not be larger than atom 
size.
  
Example: <bond ... size="0.5"/> (default)
Allowed values: positive real (optional)
color
Controls whether bonds have their own, independent, color, 
or inherit the colors from the parent atoms. By default
colors are inherited.
Example: <bond ... color="no"/> (default)
(defined in GAMGI_MESA_BOND_COLOR)
Allowed values: yes, no (optional)
red, green, blue
Set the bond color, when the bond is rendered with its own, 
independent, color.
Example: <bond ... red="0.0" green="0.8" blue="0.0"/> (default)
(defined in GAMGI_MESA_BOND_R, GAMGI_MESA_BOND_G
and GAMGI_MESA_BOND_B)
Allowed values: 0.0 - 1.0 (optional, coupled)
  
scale
Change the bond size, including its child objects. Bond objects are
scaled around the bond line. The visual representation of an object
is always scaled by its own scale factor multiplied by the scale factor
of all its parent objects until layer, inclusive.
Line widths in GAMGI are not affected by 
scale attributes, so 
bonds represented in 
wired mode remain unchanged by 
scale
(but not its child).
Example: <bond ... scale="1.0"/> (default)
(defined in GAMGI_MESA_SCALE)
Allowed values: positive real (optional)