This range is perfectly fine if you are using an alkaline medium for your measurement.

You have to find it yourself under your conditions. By the way, are the data in your figure obtained under air free conditions?

Sir Yurii V Geletii,

I used oxygen.

Hope the shown plot gives you the sufficient data (range).

Anand Parkash Your question is ill formulated. You need to get the LSV curve under Ar to see the solvent limit (water reduction)