How do i create a directivity index graph in AKABAK (VACS)?

Hi, could anyone help me find a way to generate a directivity index graph from both a vertical and horizontal polar plot simulated in akabak?
I've been modeling a waveguide I've designed for an SB26ADC and I could use vituix cad to find the directivity index, but I think the demo version of AKABAK does not allow for saving of files. I want to try and avoid the tedious task of creating frequency responses from the image tool VCAD has.
If anyone has any ideas, thanks in advance.
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From ABEC3 help, searched for PlotType. I would guess something similar, if not the same, works with AKABAK.
I assume you know this goes into Observation script and so on 🙂

List of BE_Spectrum Items

For example

BE_Spectrum
PlotType=Directivity
GraphHeader="Directivity"
PolarRange=-90, 90, 37
BasePlane=xy
Distance=100
101 Inclination=0.0 ID=56171
102 Inclination=45.0 ID=56172

In this example two frequency-directivity plots are generated in VACS. The base-plane is spanned by the x- and y-axis, with the pole at the x-axis. The first directivity arc runs in the base-plane from negative y-axis (-90deg) to positive y-axis (+90deg). The second arc is inclined by 45deg.