hi, regarding the result of course I can't say a lot without seeing it. probably somewhere inside of the geometry a connection is not as it should be. But you are right, the solver doesn't solve all frequency points. It is able to reduce the number of required frequencies based on the already available results. BTW: have you tried the new 3d solver environment introduced with HL9.3? It is in many areas easier to handle and delivers quicker results than HL3D. just let me know if you need here more assistance.
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