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FIG. 6. Effects of applying compensation for eye position on measures of RF width (SD of fitted Gaussian, left) and amplitude (right), in our population of 56 V1 neurons. _corr, A_corr are the fitted RF SD and amplitude after subtracting the eye position reported by the coil; _obs, A_obs without this correction; all fits are a least-squares fit to sqrt(spike count). In the left plot, the ordinate is (_corr² – _obs²)/(2_corr²), which is approximately the fractional change in RF SD brought about by the correction, and in the right plot, (A_corr² – A_obs²)/(2A_corr²). In both plots, the abscissa is _e:_corr: the ratio of the SD of eye position reported by the coil to the SD of the corrected RF. , results for monkey Duf; , monkey Ruf.