Example of speckle fit (a) and planet fit (b) in GRAVITY complex visibilities for an injected companion at 68 mas separation and 8 × 10⁻⁴ contrast. (a) Black: Complex visibilities V_oncompanion as outputted by the general GRAVITY pipeline and phase referenced on the star. Orange: Speckles fit with the polynomial modulation corresponding to the first term in Eq. (9). (b) Black: V_oncompanion with the speckle fit subtracted. Blue: Planet fit, corresponding to the second term in Eq. (9)