TDA2050 - power output with single compared to split supply

Hi,

I am looking at building a circuit using a TDA2050. I am very much a newcomer to amp building.

I am referencing the following spec sheet:
https://www.st.com/resource/en/datasheet/cd00000131.pdf

I am building the single-supply example circuit on page 6 as an experiment/learning exercise.

My question: When reading the Output Power vs Supply Voltage graph (which references a split rail in the X axis) should I halve my voltage value when reading the graph for a single supply? e.g., my 20V single supply will yield the same power as +/- 10V in the graph?

Thanks,
Chris.