Dear list,

I made an EXAFS analysis in Artemis (in Demeter 0.9.22) using all the available variables. This is a fragment of the .log file I got:

Independent points          : 17.7666016

Number of variables         : 17

Chi-square                  : 265.0947132

Reduced chi-square          : 345.8050781                                       

R-factor                    : 0.0026486                                         

Number of data sets         : 1

: k-range               = 2.942 - 11.043

: dk                    = 1

: k-window              = hanning

: k-weight              = 1,2,3

: R-range               = 1.115 - 3.5

: dR                    = 0.0

: R-window              = hanning

: fitting space         = r

: background function   = yes

: phase correction      = no

: background removal    = E0: 20002.215, Rbkg: 1.0, range: [2.25:17.4039986832903], clamps: 0/24, kw: 2

: epsilon_k by k-weight = 3.189e-004

: epsilon_r by k-weight = 2.339e-001

: R-factor by k-weight  = 1 -> 0.00220,  2 -> 0.00224,  3 -> 0.00392

The problem is that when I use the Nyquist criterion 

Nind=2*deltak*deltar/pi + 1

for calculating the number of independent points the value I got is much lower and close to 13.

I was not aware of this discrepancy and it caused a reviewer to think I made up the fit!