Normalized intensity of AS1. This map shows the value of normalized 20 cm intensity minus normalized 7 m + 12 m combined 1.3 mm continuum. White contours start from 3 rms with a step of 1 rms. The gray curve indicates the IF or the interface of interaction. Red and black contours represent the 7 m + 12 m combined and 7 m alone 1.3 mm continuum with the levels similar to Figs. 3 and 6, respectively.