Relation between the specific star formation rate (SSFR) and stellar mass (the so-called star formation main sequence). The solid black line represents the volume-weighted average values of SSFR as a function of M_star for our sample of 73 galaxies. Error bars correspond to the volume-weighted standard deviation. The stellar mass intervals are log M_star ∈  [9.9 − 10.3] , [10.3 − 10.7] , [10.7 − 11.1] ,and [11.1 − 11.5]. The radius of the circle is related to the flux detected at the WIDE-S 90 μm band. The distribution of fluxes shows that the lower boundary of the stellar mass versus SSFR relation corresponds to the AKARI detection limit. The average SSFR versus log M_star found by Brinchmann et al. (2004) is plotted as a dashed line. The average SSFR for the FIR-selected sample obtained by Buat et al. (2007) and 1σ errors are plotted as a dashed-dotted line.