Why filament intensity profile of filament lamp deviates from blackboady curve?

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doing experiment today in which the intensity profile of a filament lamp (of surface temp around 2000K I think) is studied by passing it through a rotating grating apparatus and then reading the output from oscilloscope.

My question is why the intensity profile intensity profile the osc.scope displayed deviated so markedly from a blackbody curve (I think the filament is to a good approx a blackbody). Although it did resemble a blackbody curve, it was not as close a fit as I would have thought. The only reason I can think of is it is for the same reason that stars emission profile also deviates, ie the elements that the body is made of impose their characteristic emission lines on the curve and so the actual curve is more jagged than it otherwise would be.

Can someone please confirm this or correct me on this issue?
 

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