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gsmooth: gaussian smoothing

Gaussian smoothing with a variable width Sigma(E), which varies as the par2 power of the energy. The width at 6 keV is set with par1

dC(E) =

1/sqrt(2*pi*Sigma(E)^2) * exp[-.5*((E-X)/Sigma(E))^2]*A(X)dX

Sigma(E) =

sigma(E/6)^alpha

where :

par1= s

gaussian sigma at 6 keV

par2= a

power of energy for sigma variation