php Graph将标记更改为100

i have a graph and it's generating well as shown below but i want Marks (Y-axis) to end at 100 instead of 125
Here is the sample index.php

<?php 
    require "chart/chart.php";
        $chart = new KoolChart("chart");
        $chart->scriptFolder="chart";
        $chart->Width = 900;
        $chart->Title->Text = "Student Marks";
        $chart->PlotArea->XAxis->Title = "Tests";
        $chart->PlotArea->XAxis->Set(array("Semester 1","Semester 2","Semester 3"));
        $chart->PlotArea->YAxis->Title = "Marks";
        **$chart->PlotArea->YAxis->LabelsAppearance->DataFormatString = " {0}";**
        $series = new LineSeries();
        $series->Name = "Progess Graph";
        $series->ArrayData(array($test1,$test2,$test3));
     $chart->PlotArea->AddSeries($series);
    ?>

The line in ** ** above is the one responsible for Y-axis.

Here is chart/chart.php http://pastebin.com/96TvRcah

Any help please?

According to this documentation you need the following:

$chart->PlotArea->YAxis->MinValue = 0;
$chart->PlotArea->YAxis->MaxValue = 100;
$chart->PlotArea->YAxis->MajorStep = 10;
$chart->PlotArea->YAxis->MinorStep = 2;

So complete code would be:

<?php 
    require "chart/chart.php";
    $chart = new KoolChart("chart");
    $chart->scriptFolder="chart";
    $chart->Width = 900;
    $chart->Title->Text = "Student Marks";
    $chart->PlotArea->XAxis->Title = "Tests";
    $chart->PlotArea->XAxis->Set(array("Semester 1","Semester 2","Semester 3"));
    $chart->PlotArea->YAxis->Title = "Marks";
    $chart->PlotArea->YAxis->MinValue = 0;
    $chart->PlotArea->YAxis->MaxValue = 100;
    $chart->PlotArea->YAxis->MajorStep = 10;
    $chart->PlotArea->YAxis->MinorStep = 2;
    $chart->PlotArea->YAxis->LabelsAppearance->DataFormatString = " {0}";
    $series = new LineSeries();
    $series->Name = "Progess Graph";
    $series->ArrayData(array($test1,$test2,$test3));
    $chart->PlotArea->AddSeries($series);