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The description on its file description page there is shown below.
DescriptionOslo population.svg
English: Population in Oslo,Norway from 1801-2006 with yearly data from 1950-2006. If anyone can fill in more detailed data before 1950 it would be great. Note that Oslo increased in area 1948, which is the reason to the sudden large increase at that year. The text is in Swedish but can easily be modified in the svg source for other languages.
Svenska: Befolkning i Oslo från 1801-2006 med årlig data från 1950-2006. Det vore fint om någon hittar och kan fylla in mer detaljerad data från före år 1950. Notera att Oslo ökade sin befolkning kraftigt 1948 på grund av större areal.
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The graph was created using gnuplot with the following commands:
set terminal svg
set output "oslo.svg"
set encoding iso_8859_1
set xlabel "År"
set ylabel "Invånare"
set title "Befolkningsutveckling för Oslo"
set nokey
plot "oslo.dat" with lines
where the file "oslo.dat" contained the following info:
{{Information| |Description=Population in Oslo from 1801-2006 (yearly data from 1950-2006) |Source=http://www.ssb.no/ |Date=2006-04-25 |Author=User:Daniel78 |Permission={{self|cc-by-sa-2.5}} |other_versions= }}