#import eh density
# note, by default, the import will be in global coordinates, so most of the grid attributes should have x=0 
#       unless we want to shift them from the position they had in DEVICE

select("eh Density1");
cleardataset;
importdataset("charge_0.mat");
set("x span",4e-6);

select("eh Density2");
cleardataset;
importdataset("charge_3.5.mat");
set("x span",3e-6);

select("eh Density3");
cleardataset;
importdataset("charge_9.5.mat");
set("x span",9e-6);

select("eh Density4");
cleardataset;
importdataset("charge_16.mat");
set("x span",4e-6);

select("eh Density5");
cleardataset;
importdataset("charge_21.5.mat");
set("x span",7e-6);
set("x",0e-6);