== Building & Discretizing the Physical Structure ==
[[Image:PO18(1).png|thumb|300px|EM.Illumina's Navigation Tree.]]
=== Grouping Objects By Surface Type ===
A new surface group can be defined by simply right clicking on one of the three '''PEC''', '''PMC''' or '''Impedance Surface''' items in the '''Physical Structure''' section of the navigation tree and selecting '''Insert New PEC...''', '''Insert New PMC...''', or '''Insert New Impedance Surface...''' from the contextual menu. A dialog for setting up the group properties opens up. In this dialog you can change the name of the group or its color. In the case of a surface impedance group, you can set the values for the real and imaginary parts of the '''Surface Impedance''' in Ohms.
<table><tr><td> [[FileImage:PO18(1)PO19.png]] [[File:PO19|thumb|250px|The PEC dialog.png]]</td>Â <td> [[FileImage:PO20.png|thumb|250px|The PMC dialog.]] </td><td> [[FileImage:PO21.png|thumb|250px|The Impedance Surface dialog.]]</td></tr>Figure 1: [[PO Module]]'s Navigation Tree and its PEC, PMC and Impedance Surface dialogs.</table>
=== Creating New Objects & Moving Them Around ===