[STEP1]
FIX = ["PB", "KEX_AB"]

[STEP2]
FIT = ["PB", "KEX_AB"]

[STEP1]
FIX = ["PB", "KEX_AB", "DW_AB,NUC->H"]

[STEP2]
FIT = ["PB", "KEX_AB"]

Fix 1H DW_AB for the fit to converge nicely
Fix 1H DW_AB for the fit to converge nicely
