Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CTI history of the EPIC pn camera   The pn camera of EPIC is inherently robust against radiation damage effects.
Nevertheless, the knowledge of charge transfer inefficiency (CTI) of the pn
camera is crucial for obtaining the correct energy scale. We describe detailed
in-orbit monitoring of this effect, utilizing the internal calibration source.
We find that during the first two years in orbit the CTI increased by about 4%
for Al-K and by about 7% for Mn-K. The increases in the CTI are well within
expectations, with no measurable effect on the energy resolution.

33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org