Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-dimensional clusters of liquid 4-He   The binding energies of two-dimensional clusters (puddles) of $^4$He are
calculated in the framework of the diffusion Monte Carlo method. The results
are very well fitted by a mass formula in powers of $x=N^{-1/2}$, where $N$ is
the number of particles. The analysis of the mass formula allows for the
extraction of the line tension, which turns out to be 0.121 K/A. Sizes and
density profiles of the puddles are also reported.

10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci