Indicates the direction cosines for the heater tube centerline with respect to the global coordinate system. For example:
When a horizontal tube centerline is along the global X-axis:
Direction Cosine X = 1.0
Direction Cosine Y = 0.0
Direction Cosine Z = 0.0
When a vertical tube centerline is along the global Y-axis:
Direction Cosine X = 0.0
Direction Cosine Y = 1.0
Direction Cosine Z = 0.0