Figure 2.

Scatter and box* plots showing the relationship of the asset index against mean** brightness of NTL; mean distance to NTL; and proportion of area covered by NTL. The x-axis of the box plots show quintiles derived from the asset-based index where 1 = most poor and 5 = least poor. *The box indicates the inter-quartile range (25% and 75%) and the thick line within the box represents the median. The whiskers represent the 2.5% and 97.5% percentiles and outliers are plotted as circles outside this range. **The mean includes pixels with zero nigh time pixel values.