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ADF7021 question (Really a question on FSK)

Hello, 

in the ADF7021 datasheet, in Figure 19, it describes a 2FSK scheme with 9.6KBPS modulation rate with 4KHz deviation. Shouldn't the modulation rate and the frequency deviation be an integer ratio? 9.6KBPS w/ 4.8KHz deviation, or 8KBPS with 4KHz deviation? Wouldn't having 9.6KBPS and 4KHz deviation generate intermod spurs in the band of interest? Or am I missing something here?

Thank you for your help!