I am creating a line graph from an excel spreadsheet. The x-axis has the days
of the month. I am plotting values from each day but some days there is no
value. When I create the cells, if I use 0 or "", in the cell, the line goes
to zero on those days. If I delete the cell (backspace) I get a break in the
line. The break is what I want. Is there some designator I can put in the
cell so I will automatically get the break?