Pulse function.
Number: 6
Names: y0, x0, A, t1, P, t2
Meanings: y0 = offset, x0 = center, A = amplitude, t1 = width, P = power, t2 = width
Lower Bounds: A > 0.0, t1 > 0.0, P > 0.0, t2 > 0.0
Upper Bounds: none
nlf_pulse(x,y0,x0,A,t1,P,t2)
FITFUNC/PULSE.FDF
Origin Basic Functions, PFW