gnuplot lost the plot

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http://unix.stackexchange.com – I'm experimenting with evolutionary algorithms and I have written two text files that I cannot get the plot. Based on the information on google, I think I have the format correct. (generation-number) (tab) (best-fitness) for example: 1 231 2 240 3 245 ... To plot this, I start gnuplot and I am greeted by the welcome screen. I then type: plot 'ga.txt' The cursor immediately returns and nothing is plotted. I am using 64 bit Mint with Mate. (HowTos)