Stellar parameters as measured in our analysis vs the pulsational periods of the stars. The iron abundance shows a negligible correlation with the period, further confirming the robustness of our analysis. On the other hand, for the other stellar parameters, the correlations reflect the location of the instability strip, with a scatter dominated by having observed the stars at a random phase in the pulsational cycle. The points are colour-coded according to the phase along the pulsational cycle within which the stars were observed, with the scale represented by the bar on the far right.