Aaron Paisley-Kerr,
Here something that might be helpful for you. This is picture that showing both the Low and High fixed frequencies of a R509LH. The R509LH transducer is using the same elements as the CM599LH this will show you the individual performance of each frequency:
View attachment 5707
Ok but what other information is going with it. Because it got no depth I can see of gain/tvg. Because all that kind of makes a difference as well?