Hi all,

I have basic question on background removal in Athena. My data has some strong changes very close to the absorption edge, and if I start the background removal at k=0, the spline is not able to follow the signal for higher k-values (even at Rbkg=1.7 or similar). The background then oscillates slowly (4 A^-1) around my signal, generating huge peaks in the low regions of chi(R). If I set the spline range to begin at k=2.7 only (around 28eV above absorption edge) then I get rid of it. Now my question in general is, do I loose essential information about the nearest neighbours this way, respectively is that a common thing to do?

Best, Julian