Extends a numerical range by a small percentage, i.e., fraction, on both sides.
numeric vector; not used if
numeric vector of length 2; defaults to the
positive number(s) specifying the fraction by which the range should be
extended. If longer than one,
A numeric vector of length 2,
r + c(-f1,f2) * diff(r), where
f and f2 is
f if it is of length
pretty which can be
considered a sophisticated extension of
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