There are many ways to fix the size of a PHP chart, and to make it monometric. A particularly simple way is to use tables and the embed command (choose appropriately width and height). See the examples below.
<title>head_a</title> <table cellpadding=0 cellspacing=0 align=center border=1 bordercolor=orange> <tr> <td> <embed width="480" height="350" src="http://macosa.dima.unige.it/handbook/graph_php/head.php"> </td> </tr> </table>
OR:
<title>head_a</title> <table cellpadding=0 cellspacing=0 align=center border=1 bordercolor=orange width=480 height=350> <tr> <td> <embed width=100% height=100% src="http://macosa.dima.unige.it/handbook/graph_php/head.php"> </td> </tr> </table>
<title>head_b</title> <table cellpadding=0 cellspacing=0 align=center border=0><tr> <td> <embed width="800" height="550" src="http://macosa.dima.unige.it/handbook/graph_php/head.php"> </td> </tr> </table>
<title>circle</title> <table cellpadding=0 cellspacing=0 align=center border=0><tr> <td> <embed width="500" height="500" src="http://macosa.dima.unige.it/handbook/graph_php/circle.php"> </td> </tr> </table>
<title>example_1</title> <table cellpadding=0 cellspacing=0 align=center width=100% border=0><tr> <td> <embed width="500" height="380" src="http://macosa.dima.unige.it/handbook/graph_php/head.php"> </td> <td> <embed width="600" height="270" src="http://macosa.dima.unige.it/handbook/graph_php/bacin.php"> </td> </tr> </table>
<title>example_1</title> <table cellpadding=0 cellspacing=0 align=center width=100% border=1 bordercolor=red><tr> <td> <embed width="500" height="380" src="http://macosa.dima.unige.it/handbook/graph_php/head.php"> </td> <td> <embed width="600" height="270" src="http://macosa.dima.unige.it/handbook/graph_php/bacin.php"> </td> </tr> </table>
<title>example_1</title> <table cellpadding=0 cellspacing=0 align=center width=100% border=0><tr> <td align=center> <embed width="450" height="340" src="http://macosa.dima.unige.it/handbook/graph_php/head.php"> </td> <td align=center> <embed width="600" height="270" src="http://macosa.dima.unige.it/handbook/graph_php/bacin.php"> </td> </tr> </table> <table cellpadding=0 cellspacing=0 align=center width=100% border=0><tr> <td align=center> <embed width="300" height="300" src="http://macosa.dima.unige.it/handbook/graph_php/spiral.php"> </td> <td align=center> <embed width="450" height="300" src="http://macosa.dima.unige.it/handbook/graph_php/ellips.php"> </td> </tr> </table>
<title>example_1</title> <table cellpadding=0 cellspacing=0 align=center width=100% border=1><tr> <td align=center> <embed width="450" height="340" src="http://macosa.dima.unige.it/handbook/graph_php/head.php"> </td> <td align=center> <embed width="600" height="270" src="http://macosa.dima.unige.it/handbook/graph_php/bacin.php"> </td> </tr> <tr> <td align=center> <embed width="300" height="300" src="http://macosa.dima.unige.it/handbook/graph_php/spiral.php"> </td> <td align=center> <embed width="450" height="300" src="http://macosa.dima.unige.it/handbook/graph_php/ellips.php"> </td> </tr> </table>