/usr/share/grace/examples/logistic.fit is in grace 1:5.1.23-6.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # ACE/gr fit description file
#
fit title "Logistic fit"
fit formula "y = 1/(1+exp(-(x-a0)/a1))"
fit with 2 parameters
fit prec 0.01
a0 = 1
a0 constraints off
a0min = 1
a0max = 1
a1 = 1
a1 constraints off
a1min = 1
a1max = 1
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