Relations between the extinction- and aperture-corrected Hβ luminosity L(Hβ) (abscissa) and different extinction-corrected luminosity ratios (ordinates). a) The GALEX FUV-to-Hβ luminosity ratio νL_ν(0.15 μm)/L(Hβ) is shown. Galaxies with EW(Hβ) ≥ 50 Å and EW(Hβ) < 50 Å are shown by red and blue symbols, respectively. The galaxies with red WISE W1 − W2 ≥ 2 mag colours are shown by large filled circles. b) Same as in a) but the GALEX NUV-to-Hβ luminosity ratio νL_ν(0.23 μm)/L(Hβ) is shown. c) Same as in a) but the SDSS u-to-Hβ luminosity ratio νL_ν(0.35 μm)/L(Hβ) is shown. d) Same as in a) but the SDSS g-to-Hβ luminosity ratio νL_ν(0.48 μm)/L(Hβ) is shown. e) Same as in a) but the SDSS r-to-Hβ luminosity ratio νL_ν(0.63 μm)/L(Hβ) is shown. f) Same as in a) but the SDSS i-to-Hβ luminosity ratio νL_ν(0.77 μm)/L(Hβ) is shown. g) Same as in a) but the SDSS z-to-Hβ luminosity ratio νL_ν(0.91 μm)/L(Hβ) is shown. h) Same as in a) but the 2MASS J-to-Hβ luminosity ratio νL_ν(1.24 μm)/L(Hβ) is shown. i) Same as in a) but the 2MASS H-to-Hβ luminosity ratio νL_ν(1.66 μm)/L(Hβ) is shown. j) Same as in a) but the 2MASS K-to-Hβ luminosity ratio νL_ν(2.16 μm)/L(Hβ) is shown. k) Same as in a) but the WISE W1-to-Hβ luminosity ratio νL_ν(3.4 μm)/L(Hβ) is shown. l) Same as in a) but the WISE W2-to-Hβ luminosity ratio νL_ν(4.6 μm)/L(Hβ) is shown. m) Same as in a) but the WISE W3-to-Hβ luminosity ratio νL_ν(12 μm)/L(Hβ) is shown. n) Same as in a) but the WISE W4-to-Hβ luminosity ratio νL_ν(22 μm)/L(Hβ) is shown. o) Same as in a) but the IRAS 60  μm-to-Hβ luminosity ratio νL_ν(60 μm)/L(Hβ) is shown. p) Same as in a) but the NVSS 20 cm-to-Hβ luminosity ratio νL_ν(20 cm)/L(Hβ) is shown.