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Table 2
Details of the observations of the considered samples.
| Galaxy | Ref. | Telescope | Diameter | Resolution | S / N | δ(O/H) |
| (m) | (Å) | |||||
|
|
||||||
| M33 | Magrini et al. (2007) | WHT | 4.2 | 10 | ~3–4 | 0.05–0.10 |
| Magrini et al. (2009b) | MMT | 6.5 | 5 | ~10 | 0.02–0.09 | |
| Magrini et al. (2010) | MMT | 6.5 | 5 | ~10 | 0.05–0.12 | |
| Bresolin et al. (2010) | Subaru | 8.2 | 4–4.5 | ≥10 | 0.08–0.12 | |
| M31 | Sanders et al. (2012) | MMT | 6.5 | 5 | ~10 | 0.06–0.2 |
| Zurita & Bresolin (2012) | Keck | 10 | 4.5–5.6 | ≥10 | 0.05–0.14 | |
| NGC 300 | Stasińska et al. (2013), Bresolin et al. (2009) | VLT | 8.2 | 5–10 | ≤10 | 0.06–0.15 |
| M81 | Stanghellini et al. (2010) | MMT | 6.5 | 5 | ~5 | 0.10–0.30 |
| Stanghellini et al. (2014) | Gemini-N | 8.2 | 5–8 | ~5 | <0.30 | |
| Patterson et al. (2012) | MMT | 6.5 | 5 | ~5 | 0.11–0.26 | |
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