Fig. 1. H I profiles of selected dwarf galaxies from our sample observed with the 100 m radiotelescope at Effelsberg which has a half power beam width of 9.3' at a wavelength of 21 cm. Local H I emission at 0 km s^-1 has been cut out as it is much stronger than the weak extragalactic emission

Fig. 2. Reproductions from the digital POSS-I: a subsample of the detected dwarf galaxies in Fig. 1. Each chart is 5 × 5 arcmin², North at top, East at west. L10 (A 0143+2633), L29 (A 0338+6806)

Fig. 3. The relative content of neutral hydrogen M_H I/L_B of the detected galaxies is plotted versus blue luminosity L_B. The solid line represents the sample of nearby galaxies (Huchtmeier and Richter 1988)