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Some distributions of XPSpeak41 are "portable" (no installation required). Simply unzip to a folder like D:\LegacyApps\XPSpeak\ and run XPSpeak41.exe directly.
: Choose between Gaussian-Lorentzian sum or product functions. Constraints : You can fix the Area Ratio (e.g., 2:1 for 2p3/22 p sub 3 / 2 end-sub 2p1/22 p sub 1 / 2 end-sub doublets) or the FWHM (Full Width at Half Maximum). xpspeak41 software download
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