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Dierential Stromgren uvby photometric obser- vations from the Four College Automated Photoelectric Telescope are presented for the magnetic CP stars 45 Leo, HR 4330, 49 Her, and HR 6718. We rened Winzer's peri- ods for 45 Leo and HR 6718 to 1.443820 days and 0.51899 days, respectively. For HR 4330 our period of 3.516 days is quite dierent from that of Winzer. That for 49 Her, 0.93663 days, is an alias of Winzer's.

uvby photometry of the magnetic CP stars 45 Leonis, HR 4330, 49 Herculis, and HR 6718