Ionised-gas metallicity gradients computed when photoionised-only spaxels are used versus when all spaxels are used. The difference between y-intercepts is shown on the x-axis, while the difference between slopes is included on the y-axis. Orange circles (cyan squares) represent the results of the fits to our slow (fast) rotators. The dashed lines in the central plot mark the zero position on each axis. The thick dashed lines in the frequency histograms mark the median value of the data on each axis.