Specifies the direction vector or direction cosines which defines the center-line of the vessel. For example, a vertical vessel in a Y-up coordinate system, these entries would read:
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Vessel Centerline Direction Cosine VX - <blank>
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Vessel Centerline Direction Cosine VY - 1.0
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Vessel Centerline Direction Cosine VZ - <blank>
If the centerlines of the nozzle and vessel are collinear, CAESAR II flags this as an error.