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letter
. 2013 Sep 14;36(10):e175–e176. doi: 10.2337/dc13-1247

Figure 1.

Figure 1

Fourier analysis of HbA1c values from 1999 to 2012. The x-axis depicts the periodicity (reciprocal of frequency) and the y-axis the strength of the oscillatory signal at different periodicities. The dominant periodicity is the first peak encountered, and the subsequent peaks are subharmonics.