Different results for same equation in curve fitting

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Why is custom fitting not the same as the exponential default one as shown in the picture? The data fits nicely when I use the 'exp2' instead.
I'm relatively new to MATLAB and this is quite baffling to me as i am unable to use a custom equation as it simply does not fit.
Ayushi Sharma
Ayushi Sharma on 15 Jul 2021
I already have a custom equation:
a*exp(-x/T) +c*(T*(exp(-x/T)-1)+x)
I need to find the value of constant 'c'
In the csv attached:
y = dv
and x= t

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