PKviKP (PKikp):
  exists from 0.00 to 155.49 degrees in the iasp91 model.
  with ray parameter from    2.071 down to    0.000 sec/deg.
  travel times from   994.57 to  1204.64 sec.

  P going down as a P in the crust/mantle, layer 0 to 5, depths 0.0 to 2889.0, then transmit down
  K going down as a P in the outer core, layer 6, depths 2889.0 to 5153.9, then reflect topside
  K going up   as a P in the outer core, layer 6, depths 5153.9 to 2889.0, then transmit up
  P going up   as a P in the crust/mantle, layer 5 to 0, depths 2889.0 to 0.0, then end

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