**Graph size**
Here you can choose the size of the graphs. Smaller size files load quickly,

with less resolution while large files show more resolution but load more slowly.

**Hold Coefficients Constant**
Here you can enter values to hold coefficients constant during fitting.

Leave the entry field blank to let the coefficient fit normally.

Note that coefficient bounds are overridden by holding a coefficient constant.

y = (qi_x/((1.0-b_x)*Di_x)) * (1.0-((1.0+b_x*Di_x*x)**(1.0-1.0/b_x)))

**Estimated Initial Coefficients**
Here you can enter values for initial parameter estimates.

Few users will need this section, as the site estimates initial

parameters using the Differential Evolution genetic algorithm

for both non-linear equations and non-Gaussian fitting targets.

y = (qi_x/((1.0-b_x)*Di_x)) * (1.0-((1.0+b_x*Di_x*x)**(1.0-1.0/b_x)))

**Coefficients Bounds**
Here you can enter coefficient upper and lower bounds. Leave the

entry fields blank to let the coefficients fit without bounds.

Note that holding a coefficient constant overrides these bounds.

y = (qi_x/((1.0-b_x)*Di_x)) * (1.0-((1.0+b_x*Di_x*x)**(1.0-1.0/b_x)))