EFLECH

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INDEX variables Index example Download
VAL[i,j]
Measuring file(s) (j=1,...) for i-th intervall. Normally, this entry is generated by TEIL automatically.
WMIN[i],WMAX[i]
Angular range for measuring values of the i-th intervall. Normally, this entry is generated by TEIL automatically.
WMIN2[i],WMAX2[i]
Angular range for peak search of the i-th intervall. Normally, this entry is generated by TEIL automatically.
OUTPUT[i]
*.par-file, peak list of i-th interval in internal form. If this file exists at starting time, is will be used as input for starting parameters. Normally, this entry is generated by TEIL automatically.
STARTPARAM[i]
This *.par-file will be used for starting parameters, OUTPUT[i] will not be used.
PROTOKOLL=Y
Switches on the full iteration protokoll.
TEST
Concatenation of all possible changes, which will performed automatically to reach the output model. Default is TEST=ND+-234U, which switches all changes to possible. The letters mean:
N
Search for new peaks.
D
Search for possible deletion of peaks.
+
Search for possible improvement of peaks RP=2->3->4
-
Search for possible simplification of peaks RP=4->3->2
2
Peaks may change to RP=2 (caused by N or -)
3
Peaks may change to RP=3 (caused by N or + or -)
4
Peaks may change to RP=4 (caused by N or +)
U
Search for simplification of background
RU
(Starting) degree of background polynomial. Otherwise, EFLECH selects a sufficient degree.
EPSILON
Maximum accuracy. Means relative error of any measured angular point. Defaults are: Therefore, in principle, counting much more than 4000 impulses for any measuring point makes no sense (in reflection geometry). But, for bad signal-to-background-ratio, the allowed accuracy per point is enlarged.

You must enlarge EPSILON for bad grain statistic (e.g. 5µ grains and both primary plus secondary soller slits). Otherwise INDEX will fail: EFLECH finds ghost peak multiplets. Such multiplets are caused by errorneous peak shape due to bad grain statistic.