xyNion,1Nion,2Nion,3.... xyNion,1Nion,2Nion,3.... xyNion,1Nion,2Nion,3.... xyNion,1Nion,2Nion,3.... xyNion,1Nion,2Nion,3....
x and y is the node's position N is the ion density Nion,3 is the ion charge density. + is for positive ion, - is for negative ion.
If you calculated 4 type of ions, then 3-6 column is the density of 4 types of ions.