Threshold heart rate

Hi could you confirm what percentages of threshold heart rate are used for sweet spot. I have been using 90-100% but have been reading old forum posts and see 88-97%. Can you confirm which to use. Many thanks in advance

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Use 90 - 97%

From the 20 minute test workout of your sweet spot training plan click the paperclick icon in the upper right of the workout to download/view your ‘FasCat Zones worksheet’ - same as the Andy Coggan zones in TrainingPeaks but you can see the formulas in there of the Excel Sheet