Error in this depiction of a Stirling engine?

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SUMMARY

The forum discussion centers on the accurate depiction of a Stirling engine's phases in a PV diagram and accompanying illustration. The user identifies a potential misalignment in the labeling of the phases, suggesting that the isothermal expansion (A) and isothermal compression (C) should be represented as isochoric due to the piston position at dead center. The user concludes that the labels may be shifted by one phase, indicating a need for clarification in the educational materials regarding the Stirling engine's operation.

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greypilgrim
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Hi.
In my (German) physics lecture notes, I found this depiction of a Stirling engine:
Stirling.PNG

According to the text, it should be
A: isothermal expansion
B: isochoric cooling
C: isothermal compression
D: isochoric heating

This seems correct for the PV diagram, but strange in the illustration on the right. Shouldn't A and C be (approximately) isochoric since that's where piston A (green) is at dead centre?
 
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It looks like the labels are shifted by one phase. B in the PV diagram is A in the sketch and so on.
 

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