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Table 4

Main parameters and their range of values used to compute Cloudy model grids for this study.

Parameters
Metallicity 1/2 Z
log of age (yr) 6–7, steps 0.2
log(n0) (cm−3) −1−3, steps 0.5
log(U)(a) −4 to −1, steps 1
Stopping criterion Ay = 2.5

Notes. (a)The ionization parameter, U, is defined in Eq. (3).

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