S/N histogram of the jack-knifed map at 1.15 mm. The mean μ and standard deviation σ, as well as the minimum and maximum of the S/Ns, are indicated in the figure. In red, a Gaussian not fit but set with zero mean, standard deviation unity, and its integral summing up to the total number of S/Ns, is overplotted to show that the theoretical distribution of S/Ns for Gaussain noise satisfactorily matches the histogram of the data in the map.