Fig. 4.

The RMS-S2S – STD space. Signal type (Eq. 10) is represented along the polar axis as the tangent of the direction from the origin to a data point. Signal magnitude (Eq. 9) is the distance from the origin to a data point. This plot is generated by calculating the RMS-S2S and the STD value for each gaze position segment, and then summarizing the data in the space in the form of a contour plot and a histogram. The contour map shows how data are distributed in the RMS-S2S – STD space, while the circular histogram on the polar axis visualizes the corresponding distribution along the signal type dimension