NDVI Metrics Bands

Hi all,

I have not been able to find any substantive documentation that explains what the bands in the Pheno NDVI metrics (L3E output) correspond to. One report states:

The starting date for the growing season (t0);
The date of the maximum growth rate (x0);
The length of the maturity plateau (L);
The date of end of the growing season (t3)corresponding to senescence or harvest.

but these would all be bounded at 366, and I am observing values in the 400s+, in addition to it not being clear whether t0 maps to Band 1, x0 to band 2, etc.

Any references would be extremely welcomed.