Range of values for the Normalized Difference Vegetation Indices with the Red-Edge spectral Index?

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#1

I am trying to find out what are the ranges of values that we can use for the Red-Edge spectral indices for Sentinel-2:

NDVIre 1: Normalized Difference Vegetation Index red-edge 1 (B8-B5)/(B8+B5)

NDVIre1n: Normalized Difference Vegetation Index red-edge 1 narrow (B8a-B5)/(B8a+B5)

NDVIre2: Normalized Difference Vegetation Index red-edge 2 (B8-B6)/(B8+B6)

NDVIre2n: Normalized Difference Vegetation Index red-edge 2 narrow (B8a-B6)/(B8a+B6)

NDVI3: Normalized Difference Vegetation Index red-edge 3 (B8-B7)/(B8+B7)

NDVIre3n: Normalized Difference Vegetation Index red-edge3 narrow (B8a-B7)/(B8a+B7)

For example with the NDVI the values are between 1 and -1
Thanks

#2

I am not sure that I understand your question, but the range of all the indices you have listed is [-1,1].