Hi, I apologize for having some installation questions of 1.3.3. version. I reinstalled a newer version of scientific python that is in Fedora. However, this time the error messages: File "/usr/local/relax-1.3.3/relax", line 53, in <module> from prompt import interpreter File "/usr/local/relax-1.3.3/prompt/interpreter.py", line 50, in <module> from dx import OpenDX File "/usr/local/relax-1.3.3/prompt/dx.py", line 35, in <module> import opendx.main File "/usr/local/relax-1.3.3/opendx/main.py", line 33, in <module> import isosurface_3D File "/usr/local/relax-1.3.3/opendx/isosurface_3D.py", line 31, in <module> from base_map import Base_Map File "/usr/local/relax-1.3.3/opendx/base_map.py", line 36, in <module> from specific_fns.setup import get_specific_fn File "/usr/local/relax-1.3.3/specific_fns/setup.py", line 27, in <module> from specific_fns.model_free import Model_free File "/usr/local/relax-1.3.3/specific_fns/model_free/__init__.py", line 34, in <module> from main import Model_free_main File "/usr/local/relax-1.3.3/specific_fns/model_free/main.py", line 37, in <module> from minfx.generic import generic_minimise File "/usr/lib/python2.6/site-packages/minfx/generic.py", line 26, in <module> from bfgs import bfgs File "/usr/lib/python2.6/site-packages/minfx/bfgs.py", line 26, in <module> from base_classes import Line_search, Min File "/usr/lib/python2.6/site-packages/minfx/base_classes.py", line 45, in <module> from line_search.more_thuente import more_thuente File "/usr/lib/python2.6/site-packages/minfx/line_search/more_thuente.py", line 386 as = secant(al, at, gl, gt) ^ SyntaxError: invalid syntax Apparently, the problem is from minfx. THanks for any help in advance. Simon Sham, Ph.D. NMR Core Facility 933 S. 19th Street CH19 B30 Phone: 205-934-5696 Email: ssham44@xxxxxxx