Superimposed tracings show questionable results.
Pearson
Helmer E
HE
D000328:Adult; D002508:Cephalometry / Q000379:methods*; D005260:Female; D006801:Humans; D008311:Malocclusion, Angle Class I / Q000000981:diagnostic imaging*; D011859:Radiography; D013382:Subtraction Technique