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Table A.1

Parameters of CMFGEN models of Mercer 30 cluster members that are not crucial for our discussions.

ID νsini a ζ mac a ξ mic a ν a β [M yr-1] C L 1 a C L 2 a,b C L 3 a,b C L 4 b Z C c Z N c Z O c

Mc30-1 65 65 15 1400 1.35 2.2 × 10-5 0.100 320 75 0.10 40 5.0 0.8
Mc30-2 10 85 15 600 2.00 1.1 × 10-5 0.250 10 60 0.15 0.7 11.4 3.1
Mc30-3 65 65 15 2500 1.05 7.3 × 10-7 0.100 50 75 0.10 1.5 1.0 7.0
Mc30-5 50 50 12 2500 0.80 1.2 × 10-6 – No clumping – 1.0 0.8 2.5
Mc30-6a 35 110 20 1600 1.75 1.2 × 10-5 0.100 65 100 0.20 0.6 4.0 3.0
Mc30-6b 100 50 17 1600 0.90 9.4 × 10-6 0.100 135 75 0.10 0.8 4.0 3.0
Mc30-7 180 65 25 2000 1.00 2.0 × 10-5 0.075 140 5 0.10 0.2 10.0 2.0
Mc30-8 65 65 25 1200 1.07 3.6 × 10-5 0.250 135 170 1.00 0.2 19.5 0.6
Mc30-9 65 65 15 2500 0.80 4.3 × 10-6 – No clumping – 1.4 0.8 4.0
Mc30-10 65 65 20 2500 1.25 2.7 × 10-6 – No clumping – 0.8 1.9 3.2
Mc30-11 150 65 20 2500 1.05 4.2 × 10-6 – No clumping – 1.0 1.0 4.0
Mc30-13 130 65 25 2500 1.50 2.7 × 10-6 – No clumping – 0.4 1.5 5.2
Mc30-18 120 100 14 2500 0.80 3.1 × 10-6 0.300 150 75 0.30 0.4 1.2 1.5
Mc30-19 65 65 17 2500 1.05 2.0 × 10-6 – No clumping – 0.9 3.5 4.6
Mc30-22 50 115 10 2500 0.80 5.4 × 10-7 – No clumping – 1.5 0.8 4.0

Notes.

(a)

The νsini, ζmac, ξmic, ν, CL2, and CL3 values are in km s-1.

(b)

The coefficients for the clumping law of Najarro et al. (2009) are used, however when CL4 = CL1 the clumping law of Hillier & Miller (1999) is recovered with a = CL1 and b = CL2 (which occurs for the Mc30-1, Mc30-3, Mc30-6b, and Mc30-18 models).

(c)

Metal abundances are expressed in mass fraction and in units of 10-3.

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