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Item _em_map_resolution.cutoff_used

Description

 The cutoff value to estimate the resolution value can be defined by:
   - the point of the curve where the correlation is 0.5
   - the point of the curve that crosses a significance threshold curve
  According to Orlova et al. 1997 (J Mol Biol, 271:417) this significance
  threshold curve is defined as the 3*sigma (sigma = standard deviation of
  the FSC) for non-symmetrical particles.  (units: 1/A) 
  [stc stands for significance threshold curve]

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