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Title: Robust Optical Richness Estimation with Reduced Scatter 
Authors: Rykoff E.S., Koester B.P., Rozo E., Annis J., Evrard A.E., Hansen S.M.,
         Hao J., Johnston D.E., McKay T.A., Wechsler R.H. 
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Code names: lambda_richness.pro

Language: IDL

Code tested under the following compilers/operating systems: 
  Linux, OS X; IDL v6.0; v7.1

Description of input data: 
  SDSS g-r color, i-band magnitude, and distance from cluster center for all 
  galaxies in the region of a galaxy cluster in the redshift range 0.1<z<0.35.

Description of output data: 
  matched filter richness estimator lambda, error on lambda, and red sequence 
  probabilities for all input galaxies.

System requirements: Any full IDL installation

Calls to external routines: None

Additional comments: Use doc_library,'lambda_richness' for full details.

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The AAS gives permission to anyone who wishes to use these subroutines
to run their own calculations.  Permission to republish or reuse these
routines should be directed to the Executive Officer of the AAS.

Note that the AAS does not take responsibility for the content of the 
source code.  Potential users should be wary of applying the code
to conditions that the code was not written to model and the accuracy of
the code may be affected when compiled and executed on different systems.
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