Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precision Optical Measurements and Fundamental Physical Constants   A brief overview is given on precision determinations of values of the
fundamental physical constants and the search for their variation with time by
means of precision spectroscopy in the optical domain.

8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat