Is simulated distillation gas chromatography tells us the percentage of n-alkanes in our crude, or it tells the % of all compounds that boil there?

which means when the mass% of my crude at boiling point for example of 500 C which corresponds to c35 is 65%

that means the c11-c35 alkanes percentage in my crude is 65% ?

or all compounds in my crude (Aromatics, naphthenes, alkanes...etc) that boils at that temperature is 65% ?

using helium as carrier fluid