You are right. There's nothing much to compare to but if I was to print out a whole bunch of eigen-mode-shape, the indicator is just somewhat confusing for the reader. Anyway, I was just being curious on the way the program came up with the value on…
Thank you Victor for your answer. I have quite the same question as h0inz which is if it is relative, why would the maximum pressure value for each eigenfrequency not the same (like 1 for example) so that we can compare?