Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HST and VLT observations of Pulsars and their Environments   The state of the art of optical studies of Isolated Neutron Stars (INSs) and
their Pulsar Wind Nebulae (PWNe) is reviewed. In addition, results obtained
from recent HST and VLT observations are presented and discussed.

24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph