Seismic vs. TGAS parallaxes for the sample of 938 analysed red giant pulsators. The thick grey line is the bisector. Red lines: fits from an errors-in-variables model where the uncertainties on both parallaxes were taken into account; blue lines: fits obtained without taking any uncertainties into account. Solid lines are a fit using the linear model Si = α + βϖi. Dashed lines are a fit using the model ϖi = κ + ρSi. The curved dotted line is a fit using the model log Di = 3 + αl−(1 + βl)log ϖi.
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