Distribution of area coefficients over the ~400 hundred channels of HSC (blue) and the averages over each sensor (orange). All a_ij coefficients are expressed in el⁻¹. We may note that the trends for channels and sensors are similar, which indicates some homogeneity within sensors (except for Σ a, where the scatter is dominated by shot noise). Σ a is the sum for −10 < i, j < 10.