## Overview

Instead of measuring the precise locations and total fluxes of the components
of Mizar we see in the maps, we use these maps for initial guesses as to these
parameters and improve these using the observed squared visiblities and phases.
## Model fit

Begin by reading an already prepared model file for 1997-05-01.
`
readmodel,'1997-05-01.model'`

calcmodel

This model has already best-fit parameter values set, but feel free to change
them. The model is stored in variables * star_model, binary_model *.

Then use Model|FIT and
Fit|INTERFEROMETRY
to bring up the following widgets, and set the fields to match what you see.
Some parts of these are clickable for further information.

Click on "Fit"
in the (large) model fit widget. This will start a
Marquardt-Levenberg non-linear least-squares fit. After this fit completes,
click on "A-B" in the model fit widget
to obtain the following listing of the parameters of the
binary component. Of course, only the selected parameter values should
have changed. The (rho,theta) result is entered into a file containing the
results from all of the nights. It is used in the next section.

`
`*
COMPONENT=A-B*

MODE= 3

WDMODE= 0

SEMIMAJORAXIS= 9.8400002 +/- 0.0000000

INCLINATION= 60.590000 +/- 0.0000000

ASCENDINGNODE= 106.10000 +/- 0.0000000

ECCENTRICITY= 0.53680003 +/- 0.0000000

PERIASTRON= 104.10000 +/- 0.0000000

APSIDALMOTION= 0.0000000 +/- 0.0000000

EPOCH= 7636.0600 +/- 0.0000000

PERIOD= 20.538370 +/- 0.0000000

RHO= 9.4227274 +/- 0.0023362788

THETA= 98.185225 +/- 0.027380840

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