Question about TDI metric

[ts-kim]

In the paper "Laura et al., Assessing energy forecasting inaccuracy by simultaneously considering temporal and absolute errors, 2017", TDI is defined in the range of [0,1].

• "TDI is a dimensionless number varying in the interval [0,1], where 0 corresponds with null temporal distortion and 1 with maximum temporal distortion"

However, your results are in the range of [0.xx, 2.xx]. (Table 1) What is the difference between the TDI measure defined in the above paper and yours?