What does the electric field for twin capacitors in series look like
I've tried to do a simulation for one and two parallel plates, shown in the pictures below. In the two-capacitor picture there is a wire connecting them that is hard to see.


The voltage is the same across both the single and the twin pair (9V)
Notably the electric field strength between the plates becomes very consistent when the relative permittivity of medium between the plates increased from 1 to 2.
The field strength between the plates for a single capacitor is twice what it is for two of them. This is the main thing I was interested in.
The field is well contained between the plates. 
I included a voltage picture for the twin capacitors.


This was in aid of trying to understand about two capacitors in series having a lower overall capacitance than one.