Unexplained volatility in T1

[SCO]

I have been away from my exoplanet work for a while due to health issues but I am now starting things up again and am testing out the equipment and software.  In testing AstroImageJ I came across a problem I can't explain.  First, the 'Multi-Plot Y Data' shows that I am plotting the relative flux of 5 stars.  The 'Plot of Measurements' shows that the star chosen as T1 is far more volatile than any of the comparison stars.  The strange thing is that, I can rotate between which of the 5 stars I choose to be T1 and it is always the same: T1 displays as far more volatile than the comparison stars.  Since this happens regardless of which star I select as T1, the problem is not with the data itself.  There is probably some setting that is causing T1 to show so much more volatility than the comparison stars.  But I can't figure out what that setting is.  I am including images of my configuration pages in case they might shed some light on the cause of the problem.

[karenacollins]

On the C2, C3, C4, and C5 plotting row in Y-data, "Page Rel" is enabled. This causes AIJ to scale and shift the signal to fit on that percent of the Y-axis plot. With scale set to 1 in that mode, the lightcurve is scaled to fit n 1%, or 1/100 of the plot in the y-direction. You'll want to instead deselect the "Page Rel" option on the C star plots.

Also, "then Shift" is set to various whole numbers. For example, 4 is being subtracted from T1. you'll want to change that setting to 0.0. If you want to offset the comp stars, use something like -0.005, -0.010, -0.015, and -0.020.

The "Page Rel" option is good for plotting systematics indicators at the bottom such as "tot_C_cnts", airmass, Y(FITS), X(FITS), FWHM, SKY so that they do not need adjusting each time, and the relative change is what is important to pick out by eye. For "page Rel" mode, I typically use Scale = 15 (%), and "then Shift" = -42 (%) to move them to the bottom of the plot (i.e. shift down from the center of the plot by 42% of the plot height).

Karen

[SCO]

That was it.  Thanks Karen!

Ed