Practical loading and calibration

When observing at two bands with the ATCA, it is generally sensible to set the two bands so that they do not overlap. In terms of sensitivity, there is nothing to be gained by setting the bands to the same frequency as the noise will be common to the the bands. Additionally having the bands overlap complicates the data reduction process in Miriad. The best approach is to avoid the problem, by setting the bands so that they do not overlap at all, or overlap by a comparatively small amount.