set term png set grid set out 'dekadak.png' set xlabel \ 'kvartaly posledni 1999 az treti 2009 - jedno desetileti' set title 'odchylky globalni teploty od prumeru let 1951-1980 / cK' a=40 b=20 f(x) = a + b * (x/40) fit f(x) '99_4-09_3.txt' via a,b plot [-0.5:39.5] [10:90] '99_4-09_3.txt' with lines, \ f(x) title '0.14 K (+- 0.06) / 10 let' quit