Results on differential reddening in the direction of NGC 416. Left: comparison between the original m_F814W vs. m_F336W − m_F814W CMD of NGC 416 (top) and the CMD corrected for differential reddening (bottom). Right: differential-reddening map in the direction of NGC 416. The levels of gray are proportional to the reddening variation, as indicated in the top right. The panels on the right show ΔE(B − V) against the abscissa for stars in eight ordinate intervals. Similarly, the panels at the top represent the reddening variation as a function of the ordinate for stars in eight intervals of X. The field is centered around the center of NGC 416 (X, Y = 6019, 5507), and the X and Y axes are parallel to the right ascension and declination direction, respectively. We adopted a scale of 0.04 arcsec per pixel.