What is the flatness of the 10-A series of attenuators?

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The flatness specification varies depending on the frequency. See table below:

10-A-MFN-1 (1dB) +/-0.3dB to 1GHz +/-0.5dB, for 1-4GHz
10-A-MFN-2 (2dB)  +/-0.3dB to 1GHz  +/-0.5dB, for 1-4GHz
10-A-MFN-3 (3dB)  +/-0.3dB to 1GHz  +/-0.5dB, for 1-4GHz
10-A-MFN-6 (6dB)  +/-0.4dB to 1GHz  +/-0.6dB, for 1-4GHz
10-A-MFN-10 (10dB)  +/-0.4dB to 1GHz  +/-0.8dB, for 1-4GHz
10-A-MFN-30 (20dB) +/-0.5dB to 1GHz +/-1.0dB, for 1-4GHz
10-A-MFN-30 (30dB) +/-0.8dB to 1GHz +/-1.3dB, for 1-4GHz