**Table 1:** The sample of CP stars used in this study and the available photometric data in the respective systems.
CP class	Stars^a	${uvby}\beta$	${\it Geneva}$	${\it UBV}$ ^b
CP1	30/13	29	30	30
CP2	79/51	78	76	63
CP3	28/14	27	27	28
CP4a	20/15	20	20	20
CP4b	17/9	14	16	15
CP4ab	2/2	2	2	2

^a Stars in total / with average temperatures.
^b Number of objects with a complete set is listed.

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