Frequency density histograms of accuracy and precision
metrics across all validation trials (combined gaze). Top: Accuracy
(average absolute error relative to target), Middle, Bottom: Precision
(standard deviation and inter-sample root mean square error of gaze
angles). Histograms are based on fixations to all presented target
positions. Means and percentiles for each measure are annotated to allow
direct comparison with device specifications. Data computed before
outlier correction. Note: Plots are truncated at a specific x value (4°,
1.5°, and 1°, respectively) to better visualize the overall
distributions and percentiles.