In most of tablature notation for fretted instruments, each line represents a string and the numerals, representing the frets where to stop the string, are printed on the respective lines.
However, for 4-stringed instruments there exists literature [1, see picture] with the tablature consisting of five lines and the numerals printed in between those lines. In this case a string is represented by a gap between two lines.
Is there nomenclature distinguishing between those two types of tablature?
1 Jehtro Burns and Ken Edison, Mel Bay's Complete Jethro Burns Mandolin Book, Mel Bay Publications, Inc., ISBN 1-56222-663-0 (1993)