 We examined behavioral features, such as the operator gaze, head movements, and hand interactionswith hotspots, and observed significant behavioral changes as a result of continuous skill improvement.
<clarity>  We examined behavioral features, such as the operator gaze, head movements, and hand interactionswith hotspots, and observed significant behavioral changes as a result of continuous skill improvement.
 We examined behavioral features, such as the operator gaze, head movements, hand interactions, and hotspots, were observed with significant behavioral trends resulting from continuous user skill improvement.