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The 3dvector construct allows one to specify a threedimensional
real vector. The construct is also used to specify
a 33 matrix by entering one row at a time (see Section
2.4).
 <3dvector>:==

 ( <real> <real> <real> )
 specifies
the vector explicitly by using the x,y,z components.
 (
 [TAIL=<selection>] [HEAD=<selection>] )
defines the tail or the head of the vector as the
center of mass of the specified atom selections
using the mass atom property (Section
2.16) and the main coordinate set x,y,z
(Section 6.1). If
HEAD is not specified, it defaults to (0,0,0); similarly for TAIL.
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