Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Imaging Spatially Extended Objects with Interferometers: Mosaicking and
  the Short Spacing Correction   Interferometry is a powerful technique for making sensitive, high-fidelity
images of the sky, but is limited in its ability to measure extended or diffuse
emission. Better images of extended astronomical objects can be obtained by
mosaicking together many pointings of the interferometer array. Even better
images can be obtained by combining these data with data from a single-dish
telescope. This lecture explains commonly practiced techniques for obtaining
and analyzing these observations, and the theory behind them.

14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat