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Table 2.

Free and fixed parameters used in each MOSFiT model fit to the second peak, with prior distributions indicated.

Parameter Distribution Range
Common parameters

nH, host [1016 : 2 × 1021] cm−2 log-uniform
texpl [−50 : 0] d uniform
Mej [0.1 : 100] M log-uniform
vej [5000 : 15 000] km s−1 uniform

56Ni model

Tmin [1000 : 50 000] K log-uniform
fNi [10−3 : 1.0] log-uniform
κ 0.34 cm2 g−1 fixed
κγ [0.1 : 104] cm2 g−1 log-uniform

Magnetar model

κ 0.34 cm2 g−1 fixed
κγ [0.1 : 104] cm2 g−1 log-uniform
Pspin [1 : 20] ms uniform
B [0.1 : 50] ×1014 G log-uniform
MNS [1.0 : 2.5] M uniform
θPB [0 : π/2] rad uniform

CSI model

Tmin [1000 : 50 000] K log-uniform
n 12 fixed
δ 1 fixed
s 0 or 2 fixed
R0 [0.1 : 250] AU log-uniform
MCSM [0.1 : 100] M log-uniform
ρ [10−15 : 10−6] g cm−3 log-uniform

Fallback model

Tmin [1000 : 50 000] K log-uniform
κ 0.34 cm2 g−1 fixed
ttr [10−4:100] d log-uniform
L1 [1050:1057] erg s−1 log-uniform

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