Illegible Characters, Quantity Approximate (Circa or Range)

• TEI definition: gap ; EpiDoc-specific customization: gap

Where vestiges of characters remain, but they cannot be recognised and their quantity is approximate, they should be placed in a gap and given a reason with a value of "illegible", and either an attribute of precision with the value "low" (to express 'circa'), or a range of possible characters lost using atLeast and atMost.