Table 1: Photometric offsets.
Data Catalog $\Delta U$ $\Delta B$ $\Delta V$ $\Delta R$ $\Delta I$

CCD:

B93 .... -0.37 0.00 -0.42 0.00

RHH92/94 .... 0.00 0.00 0.00 ....

M98 .... .... 0.00 .... 0.00

PE:

SL83 0.00 0.00 0.00 .... ....

SL85+ 0.00 0.00 0.00 .... ....

PG:

B87 0.00 (if $U\leq17.9$ ) 0.00 (if $B\leq18$ ) 0.00 (if $V\leq16.5$ )

-0.27U+4.8 (if U>17.9) -0.31B+5.64 (if B>18) -0.13V+2.17 (if V>16.5) $-0.03r_{\rm c}+0.16$ $\ast$

Reference: RHH92 Reed et al. (1992); RHH94 Reed et al. (1994); B93 Battistini et al. (1993); M98 Mochejska et al. (1998); SL83 Sharov & Lyutyi (1983); SL85+ Sharov & Lyutyi (1985) and succeeding papers; B87 Battistini et al. (1987); ( $\ast$ ) unpublished I photographic magnitudes (Federici & Fusi Pecci, private communication). The indicated offset have been applied to the photometries of the different sources to transform them into the photometric system of Barmby et al. (2000).

**Table 1:** Photometric offsets.
Data	Catalog	$\Delta U$	$\Delta B$	$\Delta V$	$\Delta R$	$\Delta I$
CCD:
	B93	....	-0.37	0.00	-0.42	0.00
	RHH92/94	....	0.00	0.00	0.00	....
	M98	....	....	0.00	....	0.00
PE:
	SL83	0.00	0.00	0.00	....	....
	SL85+	0.00	0.00	0.00	....	....
PG:
	B87	0.00 (if $U\leq17.9$ )	0.00 (if $B\leq18$ )	0.00 (if $V\leq16.5$ )
		-0.27U+4.8 (if U>17.9)	-0.31B+5.64 (if B>18)	-0.13V+2.17 (if V>16.5)	$-0.03r_{\rm c}+0.16$	$\ast$

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