Plot seeing profile

Posted by guy on Aug 07, 2017; 2:55pm
URL: http://astroimagej.170.s1.nabble.com/Plot-seeing-profile-tp727.html

Hi,
I am trying to use AIJ on solar images to obtain a measurement of the solar limb darkening function. I use the "Plot seeing profile" menu : it seems to display the normalized flux of each pixel (blue squares) as a function of the distance from the centroid (i.e. the center of the solar disk, in my case).
I have a few issues :
1/ Why is the x-axis labeled Radius [inches] and not Radius [pixels] ?
2/ Where can I find the mathematical expressions for the 4 quantities HWHM, Radius, Back> and <Back ?, and how AIJ calculates the fit shown as a Magenta line ? I quickly went through the user guide and the Collins et al papers but did not found this information.
3/ Is there a way to get the quantities plotted as Blue squares and Magenta line as an x-y ASCII file ?

Thank you for your attention
Guy