Define here the visual style applied by default to new bonds. 
Style
This menu controls which style is applied by default when creating a new 
bond: a cylinder in 
solid mode or a line in 
wired mode.
Cylinders provide a better visual quality, when coupled with lights, 
but demand more screen space and processing time. 
Lines become poorly visible when using lights, unless the ambient component 
is significant, as diffuse and specular lights are not reflected.
Size
This parameter controls the size applied by default when creating
bonds in 
Solid mode. 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 (
Size = 
0.8) slightly 
larger than bonds (
Size = 
0.5). An elegant style is to 
represent bonds with the same 
Size as atoms (
0.5).
To guarantee that bond cylinders are closed by atom spheres,
bond 
Size should not be larger than atom 
Size.
Color
This button controls whether by default the bond is represented 
with its own, independent color, or inherits the colors of the parent atoms.
r, g, b
These entries set the color used by default, between black (0.0, 0.0, 0.0) 
and white (1.0, 1.0, 1.0), when bonds are rendered with their own independent 
color.