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Table 1.
Surface brightnesses and colours for the shell-like debris feature around NGC 7531 (top row) and for an aperture placed on the arm of NGC 7531 (bottom row).
| <μg> | <μr> | <μz> | <g−r> | <g−z> | <r−z> | |
|---|---|---|---|---|---|---|
| [mag arcsec−2] | [mag arcsec−2] | [mag arcsec−2] | [mag] | [mag] | [mag] | |
| Shell | 25.43 ± 0.0019 | 24.85 ± 0.0017 | 24.50 ± 0.0012 | 0.57 ± 0.003 | 0.90 ± 0.002 | 0.34 ± 0.002 |
| NGC 7531 | 23.79 ± 0.008 | 23.60 ± 0.007 | 23.53 ± 0.007 | 0.18 ± 0.009 | 0.24 ± 0.009 | 0.06 ± 0.009 |
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