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      --- OCTCheckGradient 
      --- OCTClassicalTarget 
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OCTPositionDerivatives 
Section  Calculation Modes::Optimal Control Type  blockOCTClassicalTarget  with respect to the q array components.
Each line corresponds to a different classical particle, whereas the
columns correspond to each spatial dimension: the (i,j) block component
corresponds with the derivative wrt q[i,j].