Table 3.
The fit parameters of the empirical TSI models (k1 to k3, Eq. (8)) derived taking the reconstruction of the FCaIIK, FLα and FMgII from SA, denoted 
, 
and 
, as the FB proxy (i.e. the proxy of the TSI excess from faculae and network).
| FB proxy | k1 | k2 | k3 | 1 − R2 |  [10−2] |
RMSNR |
|---|---|---|---|---|---|---|
 |
209.0 | 10.36 | 1343.09 | 0.3072 | 4.954 | 0.1102 |
 |
643.8 | 10.36 | 1356.58 | 0.3014 | 4.785 | 0.1152 |
 |
119.1 | 10.36 | 1342.57 | 0.3088 | 5.173 | 0.1106 |
Notes. The various models are optimised to the PMOD TSI composite in such a way that k2 is identical. The agreement between model and measurement in terms of 1 − R2, 
and RMSNR, defined in Sect. 4.1, is also tabulated.
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