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Fig. 5 —Graph shows variation of D_max / D_Rmax, as defined in Appendix 1, with table height (TH). Experimental points have been derived with pencil-type ionization chamber positioned on table surface with and without cylindric water phantom on top of it. Best-fit equation shown in figure was used to define unitless offset correction function OSCF(TH) to account for effect of table height on entrance skin dose (ESD).