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Add histograms for population density (#300) #126

Job	Run time
list-e2e-tests	7s
lint	22s
build-and-push-image	46s
build-frontend	1m 48s
run-e2e-tests (./statistics_test.js)	1m 26s
run-e2e-tests (./mapper_test.js)	1m 24s
run-e2e-tests (./settings_test.js)	1m 30s
run-e2e-tests (./random_test.js)	1m 10s
run-e2e-tests (./string_check_test.js)	1m 4s
run-e2e-tests (./histogram_test.js)	1m 47s
run-e2e-tests (./quiz_test.js)	2m 52s
run-e2e-tests (./article_test.js)	3m 9s
run-e2e-tests (./search_test.js)	1m 32s
run-e2e-tests (./comparison_test.js)	1m 40s
	20m 37s

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