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Table 4

Parameters of the robust linear regressions of the scale-heights of discs as a function of the circular velocity in Eq. (18).

N A B ρ

Thin disc (zt)

All galaxies 124 26 1.23 0.55
Gas-rich 83 –12 1.42 0.77

Thick disc (zT)

All galaxies 124 –262 8.64 0.56
Gas-rich 83 –217 7.42 0.71

Notes. The number of data points used in each fit is denoted by N. The Pearson correlation coefficient is denoted by ρ.

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