In some cases it might be useful to translate an existing checkpoint or to combine two checkpoint files. The executables behind this link provide that functionality.
The syntax of the translation command is as follows:
./checkpoint_translate infilename outfilename X Y Z
The syntax of the combination command is as follows:
./checkpoint_combine infilename1 infilename2 outfilename
You can only combine two files at a time, but the newly created file can be combined with a third file and so on.
The files or more precisely the quads inside these files are combined as they are, so overlapping quads might result in an increased particle density inside the overlapping area. Ideally you first translate a checkpoint by its complete width and then combine the two, so that they do not overlap.