Overview of NGC 4414 derived from the 30′′ tapered data cube. Top-left: integrated H i intensity map (zeroth moment). The contour levels shown are (2,5,10) × 10¹⁹ cm^-2 (black) and (2,5,10) × 10²⁰ cm^-2 (white). Top-right: integrated H i intensity overplotted on a deep KPNO B-band image. The optical image is shown using a logarithmic intensity scale. Contours shown are (2,20) × 10¹⁹ cm^-2. The two short vertical lines indicate galaxy SDSS J122646.27+311904.8, as discussed in Sect. 4.2. Bottom-left: intensity-weighted mean first-moment velocity field. The thick black countour shows the systemic velocity of 711.5 km s^-1. Black contours then decrease in steps of 25 km s^-1, white contours increase in steps of 25 km s^-1. The dashed white ellipse indicates the division between inner and outer disk as defined in Sect. 3. Bottom-right: second-moment velocity dispersion map. Black contours show values of (5, 10, 20) km s^-1 (light-gray to dark-gray background). White contours show (50, 100) km s^-1 (dark-gray to black background). The white ellipse indicates the division between inner and outer disk.