Hi all, I am trying to reach Enzo's EOSCriticalDensity parameter in my pf within yt (hg hash 486d7131f1c2) . For some reason, it throws a KeyError, even though grepping EOSCriticalDensity in the DD0001/data0001 file turns it right up: $ grep EOSCriticalDensity DD0001/data0001 EOSCriticalDensity = 1e-13 I have deleted the .yt file, but to no avail. The error message is: In [1]: pf['EOSCriticalDensity'] --------------------------------------------------------------------------- KeyError Traceback (most recent call last) /home/jsoishi/build/yt-unknown/src/yt-hg/yt/utilities/command_line.pyc in <module>() ----> 1 2 3 4 5 /home/jsoishi/build/yt-unknown/src/yt-hg/yt/data_objects/static_output.pyc in __getitem__(self, key) 118 self.conversion_factors]: 119 if key in d: return d[key] --> 120 raise KeyError(key) 121 122 def keys(self): KeyError: 'EOSCriticalDensity' Can anyone provide insight? I feel fairly certain I'm doing something dumb, but I don't see what. thanks, jeff