### sa13

    // Usage: pl -gif sa13.htm
    //
    // Illustrates overlaid coordinate systems in Y
    // (Celsius vs. Fahrenheit)

    #proc page
    #if @DEVICE in png,gif
      scale: 0.8
    #endif

    // do fahrenheit..
    #proc areadef
    rectangle: 2 1 7 3
    xscaletype: date mmddyy
    xrange: 010100 063000
    yrange: -50 122
    yaxis.stubs: inc 20
    yaxis.stubrange: -40 120
    yaxis.label: Fahrenheit
    yaxis.labeldetails: size=6

    // plotting in F data could go here..

    // do celsius..
    #proc areadef
    rectangle: 2 1 7 3
    xscaletype: date mmddyy
    xrange: 010100 063000
    yrange: -45 50
    yaxis.location: min-0.9
    yaxis.stubs: inc 10
    yaxis.stubrange: -40 50
    yaxis.label: Celsius
    yaxis.labeldetails: size=6

    // plotting in C data could go here..