Table 3: Correlation coefficients, $r_{\rm c}$ , slopes and $\chi ^2$ of the linear fits to the scatter plots of modelled total solar irradiance based on NSO-512 and NSO-SPM data vs. PMOD composite measurements for different periods. The reconstructed TSI values are calculated with different conversion factors between NSO-512 and NSO-SPM magnetograms in the upper and lower halves of the table.
Time period Magnetogram $B_{\rm sat}/[{\rm G}]$ $r_{\rm c}$ Slope $\chi ^2$

Standard reconstructions (Sect. 6.1)

1978-2003 NSO-512/1.46 and NSO-SPM 340 0.89 $1.003 \pm 0.009$ 0.077

1978-1992 NSO-512/1.46 340 0.88 $1.023 \pm 0.015$ 0.111

1992-2003 NSO-SPM 340 0.93 $0.937 \pm 0.008$ 0.031

Optimized reconstructions (Sect. 6.2)

1978-2003 NSO-512/1.6 and NSO-SPM 320 0.91 $0.978 \pm 0.008$ 0.056

1978-1992 NSO-512/1.6 320 0.89 $0.968 \pm 0.014$ 0.091

1992-2003 NSO-SPM 320 0.94 $0.983 \pm 0.008$ 0.032

**Table 3:** Correlation coefficients, $r_{\rm c}$ , slopes and $\chi ^2$ of the linear fits to the scatter plots of modelled total solar irradiance based on NSO-512 and NSO-SPM data vs. PMOD composite measurements for different periods. The reconstructed TSI values are calculated with different conversion factors between NSO-512 and NSO-SPM magnetograms in the upper and lower halves of the table.
Time period	Magnetogram	$B_{\rm sat}/[{\rm G}]$	$r_{\rm c}$	Slope	$\chi ^2$
	Standard reconstructions (Sect. 6.1)
1978-2003	NSO-512/1.46 and NSO-SPM	340	0.89	$1.003 \pm 0.009$	0.077
1978-1992	NSO-512/1.46	340	0.88	$1.023 \pm 0.015$	0.111
1992-2003	NSO-SPM	340	0.93	$0.937 \pm 0.008$	0.031
	Optimized reconstructions (Sect. 6.2)
1978-2003	NSO-512/1.6 and NSO-SPM	320	0.91	$0.978 \pm 0.008$	0.056
1978-1992	NSO-512/1.6	320	0.89	$0.968 \pm 0.014$	0.091
1992-2003	NSO-SPM	320	0.94	$0.983 \pm 0.008$	0.032

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