statistics - What does the superscript used in tennis scores mean

In the score below, what do the 7 and 4 superscripts mean in the first set?

Tennis Scoring System Explained - Perfect Tennis

Tennis Scoring System Explained - Perfect Tennis

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The Tennis Organizer ~ Best Tennis Score Book & Score Sheet Charting!

Randomization and serial dependence in professional tennis matches: Do strategic considerations, player rankings and match characteristics matter?, Judgment and Decision Making

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When reading tennis scores, what does it mean when there's sometimes a superscript about the number of games won in a set? - Quora

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Tennis Statistics

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Randomization and serial dependence in professional tennis matches: Do strategic considerations, player rankings and match characteristics matter?, Judgment and Decision Making