https://bugs.kde.org/show_bug.cgi?id=408535

--- Comment #1 from Uwe Stöhr <uwesto...@lyx.org> ---
Here is the fit result of MagicPlot for comparison:

LAST FIT
Data Points Number: 35
Fitted Curves Number: 1
Parameters Number: 2
Degrees of Freedom (DoF): 33
Data Total Sum of Squares (TSS): 6.4226e8
Weighting: Standard Error (w = 1 / stdErr^2)

DATA INTERVALS
>From    To
0       1200

RESULTS
Iterations: 5
Convergence: 1.8829e-13
Residual Sum of Squares (RSS, χ^2): 64.737
Reduced RSS: 1.9617
Residual Standard Deviation: 1.4006
Coefficient of Determination R^2: 1
Adjusted R^2: 1

FITTED CURVES
Custom Curve    Fit curve       A=557.4639±22.049       B=468.3198±26.5106     
y(x) = A*exp(-B/x)

FITTED PARAMETERS
Parameter       Fit curve A     Fit curve B     
Value   557.4639        468.3198        
Std. Dev.       22.049  26.5106 

FIT FORMULA WITH VALUES
y(x) = 557.4639*exp(-468.3198/x)

FIT FORMULA WITH VARIABLES
y(x) = A*exp(-B/x)

A = 557.4639
B = 468.3198

s_A = 22.049
s_B = 26.5106

CORRELATION MATRIX
Parameter       Fit curve A     Fit curve B     
Fit curve A     1       0.9415  
Fit curve B     0.9415  1

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