The continuum images of bandwidth 3.75, 8.75, 10.0 and 4.37 MHz of FIELD I, FIELD II, FIELD III and FIELD IV, respectively. The off source rms noise is around 1.3, 2.5, 4.5 and 1.6 mJy beam−1 for FIELD I, FIELD II, FIELD III and FIELD IV, respectively.