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// GRID3 population data
var img_pop3 = ee.ImageCollection('users/henrique/GRID3_NGA_PopEst_v1_1_mean_float')
// Nigerian nightlights (1Y median)
var nighttime = ee.ImageCollection('NOAA/VIIRS/DNB/MONTHLY_V1/VCMSLCFG')
.filter('2018–09–01', '2019–09–30'))
// Demand layer
var demand = img_pop3.gte(pop_threshold) // threshold population
.multiply(nighttime.lte(light_threshold)) // population without lights
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