# DataSet Structure: Surface Currents and Charges

Table 1. Required properties for surface currents and charges.
Property name Property type Description
Frequency Axes Every surface currents and charges DataSet requires a valid frequency axis. (Hz)
MeshIndex Axes The mesh index axis refers to the mesh element on which a vertex lies. There will be duplicate entries in this list due to the fact that each mesh element will have multiple vertices.
ElectricX Quantities A complex current component in the global X-direction at a vertex. ( $\frac{A}{m}$ )
ElectricY Quantities A complex current component in the global Y-direction at a vertex. ( $\frac{A}{m}$ )
ElectricZ Quantities A complex current component in the global Z-direction at a vertex. ( $\frac{A}{m}$ )
Charge Quantities The complex charge build-up on a mesh element. ( $\frac{C}{{m}^{2}}$ )