[modeller_usage] Reading density files

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I'm trying to read a density file.  The docs (http://salilab.org/modeller/manual/node414.html) suggest that this should work

>>> m = modeller.density(modeller.environ(), "file.mrc", 10)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: __init__() takes exactly 2 arguments (4 given)

Instead, I've tried:

>>> m = modeller.density(modeller.environ())
>>> m.read("file.mrc",10)
read_data> Reading electron density of the main map
readlinef__W> File: file.mrc, Line: 1
              Modeller will only read the first 400 characters of this line.

readlinef__W> File: file.mrc, Line: 3
              Modeller will only read the first 400 characters of this line.

forrtl: severe (64): input conversion error, unit -5, file Internal Formatted Read

Any suggestions what I'm doing wrong?

Chris
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