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Deep CCD photometry in the uvby-Hbeta intermediate-band system is presentedfor the cluster NGC 2548 (M 48). A complete membership analysis based onastrometric and photometric criteria is applied. The photometric analysis of aselected sample of stars yields a reddening value of E(b-y)=0.06\pm0.03, adistance modulus of V_0-M_V=9.3\pm0.5 (725 pc) and a metallicity of [Fe/H]=-0.24\pm0.27. Through isochrone fitting we find an age of log t = 8.6\pm0.1(400 Myr). Our optical photometry and JHK from 2MASS are combined to deriveeffective temperatures of cluster member stars. The effective temperaturedistribution along the main sequence of the cluster shows several gaps. A testto study the significance of these gaps in the main sequence of the HR diagramhas been applied. The method is also applied to several other open clusters(Pleiades, Hyades, NGC 1817 and M 67) to construct a sequence of metallicitiesand ages. The comparison of the results of each cluster gives four gaps withhigh significance (one of them, centred at 4900 K, has not been previouslyreported).Comment: 11 pages, 8 figures, A&A in press. Corrected typos on Table

uvby – H$_{\beta}$ CCD photometry and membership segregation of the open cluster NGC 2548; gaps in the Main Sequence of open clusters