Deviations range from þ17.4, when u

Deviations range from þ17.4, when using the gamepad for pointing up (target orientation 90), to 13.1
, when using the
mouse for pointing down-left (135). The positive and negative
signs denote deviations in counter clockwise and clockwise direction,
respectively. All deviations recorded with the trackball were
negative, meaning that the mismatch in pointing occurred always
in a clockwise rotation. Except for the up (90) and down (90)
orientations, the average of the deviations recorded with the
trackball ranged between 3.2 and 8.1
. The deviations for the
up and down orientations in the trackball were 1.3 and 2.5,
respectively.
The standard d