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This is a updated version of mit neueren Werten. Script to create it:
bell(x) = a1/(1+cosh(a2*(x-a3)))
a1=400000
a2=0.15
a3=2000.5
fit bell(x) "./keingas" via a1,a2,a3
set termoption enhanced
set encoding utf8
set xlabel "Year"
set ylabel "Crude + condensate + NLG output+ condensate in 1000 m³"
set title "Norwegian oil output"
set key left top
set term svg
set output "norwayoilproductionandHubbert2013.svg"
plot [1970:2015] "./keingas" title "combined production", bell(x) title "Hubbert curve"
{{Information |Description ={{en|1=Norwegian oil output and a fitted bell curve}} {{de|1=Die Norwegische Ölproduktion bis 2013 und eine angepasste Glockenkurve.}} |Source ={{own}} |Author =Kockmeyer |Date ...