Corrected an error in the definition of eta.
This change had been made on the 1.2 line, but was also needed on the 1.3 line. See r6611 (http://svn.gna.org/viewcvs/relax?rev=6611&view=rev) for details.
Authored by: semor 2008-07-04
Parent: [r6664]
Child: [r6666]
