Table D.1.
Robustness of ZTF nightly color–magnitude relations to the seeing-quality cut and to the residual-magnitude test.
| Seeing cut | Variant | Npairs | m | αmedian | dα/d(−X) | r |
|---|---|---|---|---|---|---|
| g-r vs g (nightly) | ||||||
| ≤3.00″ | RAW | 81 | 0.89±0.11 | 2.28±0.02 | −2.78 ± 0.34 | 0.69 |
| ≤3.00″ | RESID | 81 | 0.83±0.11 | 2.30±0.03 | −2.59 ± 0.35 | 0.65 |
| ≤2.70″ | RAW | 63 | 0.85±0.12 | 2.28±0.03 | −2.66 ± 0.37 | 0.68 |
| ≤2.70″ | RESID | 63 | 0.83±0.12 | 2.28±0.03 | −2.59 ± 0.38 | 0.66 |
| ≤2.50″ | RAW | 44 | 0.83±0.14 | 2.31±0.04 | −2.59 ± 0.44 | 0.65 |
| ≤2.50″ | RESID | 44 | 0.82±0.15 | 2.32±0.04 | −2.56 ± 0.46 | 0.64 |
| r-i vs r (nightly) | ||||||
| ≤3.00″ | RAW | 13 | 0.66±0.24 | 1.82±0.06 | −2.93 ± 1.06 | 0.58 |
| ≤3.00″ | RESID | 13 | 0.64±0.27 | 1.84±0.07 | −2.85 ± 1.18 | 0.55 |
| ≤2.70″ | RAW | 10 | 0.61±0.31 | 1.85±0.09 | −2.74 ± 1.37 | 0.53 |
| ≤2.70″ | RESID | 10 | 0.64±0.27 | 1.85±0.10 | −2.85 ± 1.18 | 0.56 |
| ≤2.50″ | RAW | 8 | 0.46±0.15 | 1.85±0.07 | −2.04 ± 0.68 | 0.65 |
| ≤2.50″ | RESID | 8 | 0.54±0.19 | 1.84±0.10 | −2.40 ± 0.86 | 0.68 |
Notes. Seeing cut: maximum allowed PSF FWHM in arcseconds; Variant: analysis type (RAW: standard pipeline magnitudes after seeing+QC+MAD cleaning; RESID: residual-magnitude test where, in each band, a linear magnitude–seeing term is removed and the analysis is repeated on the residuals); Npairs: number of paired nightly colour measurements used in the regression;m: York slope; αmedian: median spectral index; dα/d(−X): spectral slope with brightness; r: Pearson coefficient.
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