Comment (by Leonardo Werneck):

The thorn’s output is non-standard because it deals with arrays, not grid functions. Each particles' position is evolved using the thorn’s own RK method. Thus each line of the output file looks like “time x_1 y_1 z_1 x_2 y_2 z_2 …” where the subscript is the particle ID and (x,y,z) the particle position.

I do not see the typo in line 43 of file_output_routines.C. Could you be more specific? Also note that you are looking at the master branch, but the proposed changes have not been merged yet.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2691/new-features-to-particle_traceret