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## the options menu

The options menu contains a large variety of for loading, saving, editing,
fitting, and printing data.

set vbarxrho

Inhomogeneous Solvent

Loading Options

Fitting Options

Calculator

Size Distribution Options

Sounds

Bitmaps

Very important for the analysis is the setting of the partial-specific
volume and the buffer density.

The Loading Options have
controls that allow to load with different data formats, and change the setting
of how the sedimentation time is obtained for each scan. Once loaded, the
data can be manipulated in different ways, to remove integral fringe offsets,
align the scans for jitter, or subtract blank scans. A couple of options
are available for saving the data in different formats or subsets. Finally,
dynamic light scattering data can be transformed to Sedfit
format.

The Fitting Options control the
basis parameter set (s,M) or (s,D), the adaptive change of the finite element
grid size during nonlinear regression, constraints for meniscus and bottom, and
the crossover s-value for the two finite element methods.

Size-distribution options
include a function to transform the sedimentation coefficient distribution, and
control the type of regularization used.

The Sedfit Calculator
provides AUC-specific calculations, useful for the interpretation of frictional
ratios, for F-statistics, and it allows to calculate Faxén solutions of the
Lamm equation.

Several options for residual
bitmaps control the appearance of the bitmap on the computer screen.