Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coexistence of spanning clusters in directed percolation   The probability distribution for the number of top to bottom spanning
clusters in Directed percolation in two and three dimensions appears to be
universal and is of the form $P(n) \sim \exp(-\alpha n^2)$. We argue that
$\alpha$ is a new critical quantity vanishing at the upper critical dimension.
The probability distribution of the individual masses of the spanning clusters
is found to have a Pearson distribution with a lower cutoff. Various properties
of the clusters are reported.

35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess