Score plotandprojectionofthevariablesonPC1andPC2.Variables:21
fitting parametersoftheRamanCHband.Items:10archeologicalcopals,surface
sampling. Thesamplesareseparatedin2groupsamongthePC1:thealteredand
red copalsononeside,thedryandyellowcopalsandtheotherside.Thevariables
projection showswhatparametershaveanimportantcontributiontothissepara-
tion (ex:W10,W5,K5…).