Hi, I am doing random vibration, my model is in metric units (mm, tonne, seconds). i have input of vibration profile which is in g^2/Hz, generally i use input of vibration profile in G^2/Hz, following the image below so that my results will be metric units.     how to convert g^2/Hz PSD- input to standard G^2/Hz input in optistruct using TableRND card. Kindly help me with this. Thank you in advance.