L-band total intensity contours for the rob 0 weighting images over spectral index image with color scale shown at right. The beam of the spectral index image is shown at lower left. (a) NGC 3448. Contours are at 170 (10σI), 400, 800, and 2000 μJy beam−1. The NED galaxy center is marked with a plus sign. (b) NGC 3556. Contours are at 160 (10σI), 300, 600, and 1500 μJy beam−1. The NED galaxy center is marked with a plus sign.