Examples
res = spxfit(imagename=["im0.im","im1.im"], multifit=True, spxtype="plp", spxest=[0.5,2,0.1], div="1GHz", spxsol="myplpsolutions.im")
res = spxfit(imagename=["im0.im","im1.im"], multifit=True, spxtype="plp", spxest=[0.5,2,0.1], div="1GHz", spxsol="myplpsolutions.im")