eyelink_drift_correct_diff

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<       # Draw a fixation dot
---
>       # Draw a fixation cross
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>           # if esc was pressed, ask for confirmation to abort:
>           if self.experiment.eyelink_esc_pressed:
>               self.experiment.eyelink.confirm_abort_experiment() # raises an exception if confirmed
>
>               # if not confirmed, set esc pressed back to false
>               self.experiment.eyelink_esc_pressed = False
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>