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+This directory contains all the code for this thorn which "knows" about
+general relativity.
+
+The main source files in this directory are as follows:
+
+driver.cc
+ Top-level driver for the whole thorn.
+
+horizon_function.cc
+ Computes the LHS of the AH equation, $H = H(h)$.
+
+horizon_Jacobian.cc
+ Computes the Jacobian of the $H(h)$ function, $J[H(h)]$.
+
+AHFinderDirect.hh
+ Overall header file for all the external routines in this directory.
+
+gfn.hh
+ Defines the gfns of all the gridfns.
+
+cg.hh
+ This is a "dangerous" header file which defines the "virtual machine"
+ used by the machine-generated code in ../gr.cg/.
+
+doit.maple
+ Top-level driver for all the Maple code.
+
+setup_gr_gfas.maple
+gr_gfas.minc
+ These files define the relativity gridfns for the Maple code,
+ eg the 3-metric, 3-extrinsic curvature, etc.
+
+auxiliary.maple
+curvature.maple
+horizon.maple
+ These files compute the $H(h)$ function and the $J[H(h)]$
+ coefficients in Maple.
+
+maple.log
+ This is a log file (transcript) of the Maple computation.