Mysterious Output in formatted Notebook

*To*: mathgroup at smc.vnet.net*Subject*: [mg104659] Mysterious Output in formatted Notebook*From*: John <jwa0 at lehigh.edu>*Date*: Fri, 6 Nov 2009 05:15:46 -0500 (EST)

Mathematica 6, xp windows My notebook is mostly paragraphs of text interspersed with sections and subsections, tables, plots and displayed formulas. Students will view it in class and later on Mathematica Player. or reason Out [integer]=Null^i is printed between paragraphs and headings (section or subsection). The exponent i is usually the number of preceding paragraphs. What is it telling me? What causes it, and how can I get rid of it?