Table A1.

Coefficients ${\mathrm{f}}_1$ of the fits performed for the ${\mathrm{f}}_{\text{MV}}(\mathrm{d},\mathrm{L})$ factors as a function of the distance, d, (Eq. (13)) and for the three megavoltage beams.

			Square Field Size (cm)
	4	8	10	12	16	20
6 MV	$-7.989\mathrm{E}-04$	$-1.897\mathrm{E}-03$	$-2.642\mathrm{E}-03$	$-3.386\mathrm{E}-03$	$-4.598\mathrm{E}-03$	$-5.933\mathrm{E}-03$
10 MV	$-1.654\mathrm{E}-03$	$-2.553\mathrm{E}-03$	$-3.208\mathrm{E}-03$	$-3.864\mathrm{E}-03$	$-4.316\mathrm{E}-03$	$-5.775\mathrm{E}-03$
15 MV	$-1.673\mathrm{E}-03$	$-3.175\mathrm{E}-03$	$-3.886\mathrm{E}-03$	$-4.598\mathrm{E}-03$	$-5.456\mathrm{E}-03$	$-6.250\mathrm{E}-03$