gnuplot> set logscale
''gnuplot> set xrange[1:3]''
''gnuplot> plot "data1.dat" using 1:2 notitle with lines,\''
''gnuplot> "data2.dat" usi 1:3 ti "凡例１" w lines''
''gnuplot> set xlabel "x"''
''gnuplot> set ylabel "y"''
''gnuplot> set title "タイトル"''
''gnuplot> replot''
''gnuplot> set xtics 2''
''gnuplot> set format y "10^{%g}"''
''gnuplot> set terminal postscript eps enhanced''
