  We analyzed uvby and Hp light curves of 19 well observed magnetic CP stars
selected from the "On-line database of photometric observations of mCP stars"
of which light curves in all the five colours were similar. We assumed that
among these photometrically simply behaving (PSB) stars could be found such
ones which have a single photometric spot. The insight into such simple
situations would help us to comprehend more complicated cases. Light curves of
the 19 PSB mCP stars proved to be generally nearly symmetric but surprisingly
diverse. The analysis shows that only in the case of HD 110956B, HD 188041, and
perhaps HD 193722 we are able to explain their photometric behaviour by a
simple one-spot model. Consequently, occurrence of more than one photometric
spot on an mCP star is typical.
