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LMS Test.Lab signature testing - overall order noise

I have measured data for 1.2 L,3cylinder engine exhaust noise from 1300 to 5000rpm. In this exhaust overall is gradually increasing minimum to maximum but order noise is doesn't increasing gradually. Pls explain that order noise can I explain briefly.
Following attachment graph.

Re: LMS Test.Lab signature testing - overall order noise

Siemens Phenom Siemens Phenom
Siemens Phenom

Hello,  the waterfall data displayed in a colormap or waterfall will probably explain this better.  If you look, 3rd order and 4.5 order are increasing gradually.  I expect some of the frequency information is also increasing.  


The overall level would include all order content and frequency content in the measurement at each speed..