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gsmooth(data [[, axis], width, /normalize,
/fullnorm, /balanced, /all])
Returns a smoothed version of data, with a gaussian
smoothing kernel with a FWHM of width elements along axes
axis. Both axis and width may
have more than one element, in which case multiple smoothing passes are
performed using subsequent values of these arguments.
Keyword /fullnorm specifies that the weighted sum of data values
is always normalized with the full sum of weights in the kernel: it adds
in data values beyond the edges of data as zeros.
Keyword /balanced reduces the width of the included data set so
that the weighted and included data is always balanced around the
central point: in this way, a smoothed version of a straight line is
also a straight line.
Keyword /all specifies that all axes must be smoothed along, but
is ignored if axis is specified.