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OPT3101: Why Indoor accuracy is less compared to outdoor accuracy for OPT3101 EVM

Part Number: OPT3101

https://www.ti.com/lit/an/sbaa296/sbaa296.pdf

Regarding above link one can find from section 2.2 that measurement error in indoor is almost triple compared to outdoor.  For indoor case 17cm error coming at 8m and for outdoor 6cm only coming at 8m target distance. Noise as expected found high on outdoor. Anyone know why accuracy low in indoor compared to outdoor?