Just a simple question: how does one get a delta, and only a delta, to indicate that there is invisible text at a particular point in the text? I can make text completely invisible with the command "iv" on the command line, I can obtain a label with the command "lb" on the command line, etc. But no delta. With "lb" I get, of course, a diminutive 3 preceding the label. Or am I misinterpreting the remarks that were made here about the delta? M.W. Poirier