How do I confirm the playback eq on the tapedeck (reel) meets the standard ?

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Here's chart showing the 'measured' playback eq for three speeds on a reel to reel recorder (a sony tc-560). While they 'look' ok, how do I make sure the eq does not need tweaking. Is there a reference (nab ? riaa ?) that I could compare with ? Where can I get it ?

An externally hosted image should be here but it was not working when we last tested it.



er..please excuse the 60hz spike. my not-so-scientific-laboratory-grade test setup/cables were picking up hum.
 
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