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\newlength
Synopsis:
\newlength{arg}
Allocate a new length register (see Lengths). The required argument
arg must begin with a backslash, \
. The new register holds
rubber lengths such as 72.27pt
or 1in plus.2in minus.1in
(a LaTeX length register is what plain TeX calls a skip
register). The initial value is zero. The control sequence
\arg
must not be already defined.
An example:
\newlength{\graphichgt}
If you forget the backslash then you get ‘Missing control sequence inserted’. If the command sequence already exists then you get something like ‘LaTeX Error: Command \graphichgt already defined. Or name \end... illegal, see p.192 of the manual’.