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Gradient index

GI = 3.000

GI=V50%V100%=PIV50PIV\mathrm{GI}=\frac{V_{50\%}}{V_{100\%}}=\frac{\mathrm{PIV}_{50}}{\mathrm{PIV}}

GI = PIV_{50%} / PIV. Lower is a sharper fall-off (SRS/SBRT).

Laser