The program frscan_kcor_v2.pro  will perform a radial intensity scan on a K-Cor pB image. 
Use kcor_l2.fts images or kcor_l2_avg.fts, or kcor_l2_extavg  fits images. 
These are calibrated polarization brightness intensity images. You can use .fts or .fts.gz; either is fine. 
Do not use kcor nrgf images as they are scaled contrast images and the numbers are meaningless. 

Here is an example of how to run the program. I used an image from Sept 9, 2017. 


IDL>  frscan_kcor_v2,'20170909_172030_kcor_l2_extavg.fts.gz',265.,1.08,2.9,.01,/text,ymin=1.e-10,ymax=1.e-5

Where:  265 = Position angle of radial scan, 1.08=starting height in Rsun, 2.9 = ending height in Rsun, 
0.01=stepsize in Rsun (0.01 = ~2 KCor pixels), /text creates a text file with the scan values for 
later use, ymin and ymax are optional. They allow the user to set the y-axis range of the intensity 
scan plot. The default range is 1.e-10 to 1.e-6 B/Bsun intensity.

One more thing, you can  Ignore this error from the code:  
% Program caused arithmetic error: Floating illegal operand. You get that every time you run the code.


I ran the command above and it produced this output:
20170909_172030_kcor_l2_extavg_pa265.00.txt
20170909_172030_kcor_l2_extavg_pa265.00_img.gif
20170909_172030_kcor_l2_extavg_pa265.00_plot.gif

The helmet streamer on Sept 9, 2017 was so bright I set the upper value of the scan to 1.e-5
On this day is, to the best of my knowledge, the brightest helmet structure seen in K-Cor. 
This structure erupted at ~15 UT on Sept 10, 2017 to produce a GLE level SEP storm.