Table 3
Coefficients ak for polynomial SBCRs in the form 
with their corresponding uncertainty σak.
| Ref | Class | l1 | l2 |  |
 |
 |
 |
 |
 |
rms |
|---|---|---|---|---|---|---|---|---|---|---|
| dB98 | III | 1.5 | 3.7 | 2.657 | 1.421 | −0.033 | 0.03 | |||
| С14 | all | −0.9 | 3.7 | 2.624±0.009 | 1.798±0.020 | −0.776±0.034 | 0.517±0.036 | −0.150±0.015 | 0.015±0.002 | 0.10 |
| С14 | I+II | −0.88 | 3.21 | 2.291 | 2.151 | −0.461 | 0.073 | 0.08 | ||
| С14 | III | −0.74 | 3.69 | 2.497 | 1.916 | −0.335 | 0.050 | 0.07 | ||
| dB05 | all | −0.1 | 3.7 | 2.565±0.016 | 1.483±0.015 | −0.044±0.005 | 0.04 |
Notes. l1 = (V − K)1 and l2 = (V − K)2 are the limit of the validity domain of the SBCRs. The number of measurements N over which the calibrations of the five SBCRs listed in this table were performed are 14, 132, 12, 41, and 41. The rms of this table (based on the 
definition of the surface brightness) should be divided by 10 (following Eq. (8)) to be compared to the rms of Table 2, which is based on the 
definition of the SBCR. The references are the following: dB98 (di Benedetto 1998, Eq. (3)), C14 (Challouf et al. 2014), dB05 (Di Benedetto 2005).
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