Zoomed-in image covering about 4 × 4 square degrees (a) before calibration, (b) calibration with all baselines, (c) calibration excluding baselines shorter than 300 wavelengths, and (d) calibration without excluding short baselines and with a model for the large-scale diffuse structure. The rectangle in red is about 500 × 500 pixels, and within this rectangle, the sum of all pixels is (a) 1105, (b) 597, (c) 1154, and (d) 977 Jy/PSF, respectively.