Fix typo in cache loading
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@ -116,7 +116,7 @@ cache_file = pathlib.Path( cache )
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if cache_file.is_file() and not no_cache:
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if verbose:
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print( 'using cache' )
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with shelve.optn( str( cache_file ) ) as cache:
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with shelve.open( str( cache_file ) ) as cache:
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for key in [ 'data' , 'border' , 'calibrations' ]:
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if key not in cache:
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raise Exception( 'spectrum.py: missing data in cache file' )
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