Exponential peak
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Figure: Left two peaks of type 'Exponential -', right two of type 'Exponential+'.
Exponential is limiting case of:
| Universalpeak | q=0; m=0 |
| Poisson | q=0 |
Used to fit:
Formula / Parameters:
| Parameter: | Meaning | Range |
| c | Position of maximum | unrestricted |
| h | Height at maximum | unrestricted |
| w | Halfwidth Gauss | unrestricted |
