EFLECH variables

INDEX

INDEX variables

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Historically, EFLECH is a very old program. I have developed EFLECH between 1980 and 1990. The peak model involved in BGMN was developed inside EFLECH, originally. So, EFLECH was the first program using the fundamental parameter's peak model described on these web pages. But, in contrary to BGMN, EFLECH is a purely peak fitting program using the fundamental parameter's peak model. Additional, EFLECH is more than a pure peak fit program: EFLECH hacks automatic for peaks. So, you may run EFLECH with no start diagram! Similar to BGMN, EFLECH automatically choses the degree of background polynom. And, subsequently, EFLECH adds peaks, changes peak parameter numbers, deletes peaks, reduces background polynom according to statistic tests. EFLECH delivers a peak listing: a *.par file similar to those delivered by BGMN. But, in addition to BGMN, EFLECH's *.par files include a covariance matrice of all peak parameters. The OUTPUT program shows these error informations in the peak listing.

In 1996, I have started developing INDEX. This indexing program uses the covariance matrice delivered by EFLECH. So, it may handle bad diagrams with low peak quality. INDEX did not use triplets or quartets of peaks. It mostly delivers the best possible solution for indexing. INDEX uses a random search algorithm. This means, it needs for a fast processor (Pentium Pro or Pentium II) and a lot of computing time (2 hours for every trial orthorhombic/monoclinic/triclinic indexing).