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Table 3

Surface brightness fluctuations and colour measurements corrected for galactic extinction.

Annulus  ⟨ r ⟩  B − V B − R
(arcsec) (mag) (mag) (mag) (mag) (mag)
NGC 4621
Main 81 32.83  ±  0.10 31.84  ±  0.06 30.94  ±  0.08 0.893  ±  0.002 1.449  ±  0.002
1 29 32.43  ±  0.09 31.75  ±  0.07 30.96  ±  0.06 0.912  ±  0.001 1.474  ±  0.001
2 58 32.83  ±  0.10 31.83  ±  0.06 30.94  ±  0.08 0.900  ±  0.001 1.455  ±  0.001
3 95 32.83  ±  0.10 31.81  ±  0.06 30.93  ±  0.07 0.884  ±  0.002 1.439  ±  0.003
4 132 32.87  ±  0.11 31.74  ±  0.07 30.90  ±  0.08 0.871  ±  0.005 1.431  ±  0.006
5 193 32.63  ±  0.12 31.59  ±  0.06 30.81  ±  0.06 0.839  ±  0.008 1.391  ±  0.011
SN 1939B 55 33.01  ±  0.10 31.84  ±  0.07 30.97  ±  0.08 0.915  ±  0.001 1.469  ±  0.001
NGC 4374
Main 93 33.31  ±  0.08 32.11  ±  0.04 31.40  ±  0.08 0.925  ±  0.002 1.494  ±  0.003
1 20 32.43  ±  0.06 31.51  ±  0.04 31.01  ±  0.08 0.945  ±  0.001 1.521  ±  0.001
2 39 33.08  ±  0.07 32.03  ±  0.04 31.33  ±  0.08 0.931  ±  0.001 1.501  ±  0.002
3 63 33.36  ±  0.09 32.23  ±  0.03 31.45  ±  0.08 0.922  ±  0.002 1.489  ±  0.004
4 88 33.58  ±  0.08 32.23  ±  0.02 31.41  ±  0.08 0.919  ±  0.003 1.486  ±  0.006
5 122 33.47  ±  0.10 32.22  ±  0.03 31.44  ±  0.08 0.919  ±  0.006 1.486  ±  0.011
SN 1991bg 58 33.87  ±  0.07 32.13  ±  0.04 31.43  ±  0.08 0.927  ±  0.002 1.495  ±  0.00
SN 1957B 59 33.50  ±  0.09 32.13  ±  0.03 31.35  ±  0.08 0.917  ±  0.002 1.484  ±  0.00

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