Ior vs reflectance in 0-1 chart

reference: https://forum.corona-renderer.com/index.php?topic=11024.0

“dubcat” updated it with sample values from Corona 1.4 (2016-02-06 Daily), in case there have been ninja fixes.

Plastic = 2-5% reflectance = 1.3 – 1.6 IOR
Gemstones = 17% reflectance = 2.4 IOR

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