Mosaic observations are now routinely performed with the Plateau de Bure interferometer, at
both 3 mm and
1.3 mm. It has proven to be a very
efficient method to map extended sources, including using the most
extended configuration of the array. The number of fields are usually
, but can be more important in some cases: as of the date of
writing, the largest observed mosaic has 20 fields. Data processing
requires a few more operations than normal observations, but does not
present any specific difficulties. Reconstruction and deconvolution
algorithms are available in the MAPPING software.