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| Sample | Galaxy type | #Galaxies | Gas fraction | Error gas fraction | ||
| Huchtmeier (1989) | E | 46 | 0.36 | 0.16 | ||
| Huchtmeier (1989) | Sa | 154 | 0.49 | 0.17 | ||
| Huchtmeier (1989) | Sb | 635 | 0.53 | 0.16 | ||
| Huchtmeier (1989) | Sc | 1284 | 0.59 | 0.18 | ||
| Huchtmeier (1989) | Sd | 730 | 0.67 | 0.21 | ||
| Karachentsev et al. (1999) | E | 7 | 0.007 | 0.008 | ||
| Karachentsev et al. (1999) | Sa | 1 | 0.0003 | - | ||
| Karachentsev et al. (1999) | Sb | 6 | 0.015 | 0.015 | ||
| Karachentsev et al. (1999) | Sc | 21 | 0.078 | 0.092 | ||
| Karachentsev et al. (1999) | Sd | 45 | 0.19 | 0.14 | ||
| combined | E | 53 | 0.33 | 0.18 | ||
| combined | Sa | 155 | 0.48 | 0.17 | ||
| combined | Sb | 641 | 0.52 | 0.16 | ||
| combined | Sc | 1305 | 0.59 | 0.18 | ||
| combined | Sd | 775 | 0.67 | 0.26 | ||
| Sample | Galaxy type | #Galaxies | [Fe/H](gas) | Error [Fe/H](gas) | ||
| Kewley et al. (2005) | E | 9 | -0.09 | 0.18 | ||
| Kewley et al. (2005) | Sa | 6 | -0.08 | 0.27 | ||
| Kewley et al. (2005) | Sb | 18 | -0.09 | 0.27 | ||
| Kewley et al. (2005) | Sc | 34 | -0.13 | 0.16 | ||
| Kewley et al. (2005) | Sd | 18 | -0.42 | 0.32 | ||
| Nagao et al. (2006) | E | 3 | -0.74 | 0.22 | ||
| Nagao et al. (2006) | Sa | 1 | -1.05 | - | ||
| Nagao et al. (2006) | Sb | 3 | -0.71 | 0.19 | ||
| Nagao et al. (2006) | Sc | 5 | -1.07 | 0.34 | ||
| Nagao et al. (2006) | Sd | 47 | -0.92 | 0.24 | ||
| Izotov et al. (2007) | E | 2 | -0.85 | 0.1 | ||
| Izotov et al. (2007) | Sa | 1 | -1.04 | - | ||
| Izotov et al. (2007) | Sb | 2 | -0.66 | 0.24 | ||
| Izotov et al. (2007) | Sc | 8 | -0.84 | 0.30 | ||
| Izotov et al. (2007) | Sd | 23 | -0.95 | 0.31 | ||
| combined | E | 14 | -0.34 | 0.39 | ||
| combined | Sa | 8 | -0.32 | 0.50 | ||
| combined | Sb | 23 | -0.22 | 0.36 | ||
| combined | Sc | 47 | -0.35 | 0.42 | ||
| combined | Sd | 88 | -0.83 | 0.34 | ||
| Sample | Galaxy type | #Galaxies | U-B | Error U-B | B-V | Error B-V |
| HyperLeda database | E | 547 | 0.36 | 0.21 | 0.83 | 0.13 |
| HyperLeda database | Sa | 166 | 0.14 | 0.23 | 0.68 | 0.17 |
| HyperLeda database | Sb | 329 | 0.02 | 0.19 | 0.61 | 0.16 |
| HyperLeda database | Sc | 397 | -0.10 | 0.15 | 0.50 | 0.13 |
| HyperLeda database | Sd | 173 | -0.23 | 0.20 | 0.39 | 0.17 |
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