Update README.md

README.md

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-# Galaxy-Assembly-Bias-in-SDSS-CMASS
+On the constraints of galaxy assembly bias in velocity space
 
+Kevin Spencer McCarthy, Zheng Zheng, Hong Guo, Wentao Luo, and Yen-Ting Lin
 
-Paper Files
+Accepted, MNRAS, 509, 2021 September 13, Pages 380-394
+
+Code Files
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 Clustering Measurement
+
 xi_su_tree.c - A C program to calculate the 2-point correlation function for a lightcone distribution of galaxies. Pair counts are performed with a tree structure, only computing pairs for galaxies in the current and neighboring cells to expedite computation.
+
 fileprep_tree.py - A Python program to build a table that will localize a galaxy in a particular cell determine by transforming the galaxy coordinates from redshift-space to Cartesian and dividing up the (X,Y,Z)-space into cells/bins dependent on the clustering scales of interest.