I have played with overwriting text on charts by using 'white' text and
various other tricks.
As David W. said, there's usually a slight ghost left behind.
My recommendation would be first and foremost to set up a miniscript to
regenerate your plot, and change the title text to whatever you really
want, rather than hacking the display via overwrites.
Second, you might want to draw a borderless box )with fill color equal
to your chart background) over the existing text, then write the new title.
Carl
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