i am optimizing a reactive distillation column. I have simulated a base case in Aspen Plus and now want to calculate its total annual cost in Matlab. while linking aspen Plus and Matlab i need path to node for column diameter from variable explorer in aspen plus i guess the path to node should be " reactive_distillation.Tree.FindNode("\Data\Blocks\RDC\Subobjects\Column Internals\INT-1\Subobjects\Sections\CS-1\Output\CA_DIAM1"). But this path gives zero value for diameter while column diameter is 2.43 can you help in this? what path should i use for this in aspen version 10.