After reading through the NX NASTRAN Advanced Dynamics Guide, MBDEXPORT seems like a very useful to get a state space model reduced to some number of modes, whether by normal modes or CMS. To use is, I simply want to confirm what the order of the DOF's is in the output vector. If I specified a single 6-DOF node called u, it could be [u1, u2, u3, u4, u5, u6]. Or, it could be the opposite order. Also, if I specify multiple output nodes, I don't know what order those would be in.
My question is: how can I know the order of the output DOF's for use of a state space representation?