1. Removable truss has 15mm thick gussets, all other gussets on the structure are 10mm thick. The first mode is 246.4Hz Removable truss has 15mm thick gussets, all other gussets on the structure are 5mm thick. The first mode is 246.5Hz

2. Fig 3. Removable truss has 15mm thick gussets, no gussets elsewhere on the structure. The first mode is 243.3Hz Fig 4. Removable truss has 10mm thick gussets, no gussets elsewhere on the structure. The first mode is 237.3Hz.

3. Fig 5. Removable truss has 5mm thick gussets, no gussets elsewhere on the structure, the first mode is 216Hz. Fig 6. Dummy tablecloth with gussets everywhere on structure, the first mode is 208Hz.

4. Dummy tablecloth with no gussets elsewhere on the structure apart from the removable truss, the first mode is 202Hz.