set grid set time set data style linespoints set logscale x set logscale y set key right bottom set xlabel 'h' set ylabel 'módulo do erro = analítico - numérico' plot 'saida19a.txt' using 1:2 title "UDS" replot 'saida19a.txt' using 1:3 title "DDS" replot 'saida19a.txt' using 1:4 title "CDS2" replot 'saida19a.txt' using 1:5 title "CDS4" set title 'derivada de exponencial(X)' replot