The file AR-CODES.tar contains three  codes: AR0.f, ARC.f, A3B.f.
These contain all the subroutines in one single file.
The command 'makeall' (file inside the .tar) should give
all the executables.

AR0.f = Pure N-body code that uses algorithmic regularization.
        No external perturbations.
        All subroutines are in the same file. INCLUDE 'COMAR0.CH' in several routines.
	After compiling it (executable = AR0.x)
	you may try the command
	AR0.x<input.ar0
	where input.ar0 is the data file (example included).
	Body masses may have any values.

ARC.f= N-body code (algorithmic regularization), with possibility
       for external accelerations (user defined in subroutine EXTERNAL ACCELERATIONS).
       INCLUDE 'COMARC.CH' in many routines. 
       Compile the file and try a test run  (with executable = ARC.x)
       ARC.x<input.arc
       Body masses may have any values.

A3B.f = A simple 3-body code. LogH-method, triangle coordinates, 
        comparable masses only. No included files, all inside A3B.f.
        Usage: A3B.x<input.a3b

 You should get all the executable by the command:  makeall 
 (assuming makeall is executable).