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Table 3
Comparison table providing the most relevant previous studies on stellar population gradients.
| Reference | Sample size | Observation type | Radial range | ∇log AgeL | ∇[Fe/H]L | Units |
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| Davies et al. (1993) | 13 | Long-slit | 1–1.3 Reff | – | –0.2 ± 0.10 | dex/dex |
| Mehlert et al. (2003) | 35 | Long-slit | 1 Reff | ~0 | –0.16 ± 0.12 | dex/dex |
| Wu et al. (2005) | 36 | Photometry | <5 Reff | 0.02 ± 0.04 | –0.25 ± 0.03 | dex/dex |
| Sánchez-Blázquez et al. (2006) | 61a | Long-slit | <1 Reff | 0.08 ± 0.01 | –0.21 ± 0.02 | dex/dex |
| Sánchez-Blázquez et al. (2006) | 21b | Long-slit | <1 Reff | 0.03 ± 0.07 | –0.33 ± 0.07 | dex/dex |
| Brough et al. (2007) | 6 | Long-slit | <1 Reff | 0.01 ± 0.04 | –0.31 ± 0.05 | dex/dex |
| Reda et al. (2007) | 12 | Long-slit | 1 Reff | 0.04 ± 0.08 | –0.25 ± 0.05 | dex/dex |
| Sánchez-Blázquez et al. (2007) | 11 | Long-slit | <1 Reff | 0.16 ± 0.05 | –0.33 ± 0.07 | dex/dex |
| Rawle et al. (2008) | 12 | IFU | 1 Reff | 0.08 ± 0.08 | –0.20 ± 0.05 | dex/Reff |
| Spolaor et al. (2008) | 2 | Long-slit | <1.5 Reff | –0.01 ± 0.04 | –0.42 ± 0.06 | dex/dex |
| Kuntschner et al. (2010) | 48 | IFU | <1 Reff | 0.02 ± 0.13 | –0.28 ± 0.12 | dex/dex |
| Rawle et al. (2010) | 19 | IFU | 1 Reff | –0.02 ± 0.06 | –0.13 ± 0.04 | dex/Reff |
| Spolaor et al. (2010) | 14 | Long-slit | 1–3 Reff | 0.03 ± 0.17 | –0.22 ± 0.14 | dex/dex |
| Koleva et al. (2011) | 40 | Long-slit | <2 Reff | ~ 0.1 | ~–0.2 | dex/Reff |
| La Barbera et al. (2012) | 674 | Photometry | <8 Reff | ~ 0.1 | ~–0.4 | dex/dex |
| González Delgado et al. (2015) | 41 | IFU | 0–1 Reff | ~–0.25 | ~–0.1 | dex/Reff |
| González Delgado et al. (2015) | 41 | IFU | 1–2 Reff | ~–0.05 | ~–0.1 | dex/Reff |
| Wilkinson et al. (2015) | 5 | IFU | <1.5 Reff | ~0 | –0.15 ± 0.14 | dex/Reff |
| Goddard et al. (2017) | 505 | IFU | <1.5 Reff | 0.004 ± 0.06 | –0.12 ± 0.05 | dex/Reff |
| Zheng et al. (2017) | 463 | IFU | <1.5 Reff | –0.05 ± 0.01 | –0.09 ± 0.01 | dex/Reff |
| This work (E-MILES) | 23 | Photometry | <2–3.5 Reff | 0.02 ± 0.06 | –0.09 ± 0.06 | dex/Reff |
| This work (E-MILES) | 23 | Photometry | <2–3.5 Reff | 0.03 ± 0.21 | –0.17 ± 0.13 | dex/dex |
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| Median values | 0.00 ± 0.05 | –0.12 ± 0.03 | dex/Reff | |||
| 0.03 ± 0.01 | –0.25 ± 0.06 | dex/dex | ||||
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