Missing Lines Between Data Points

[al]

I constructed a simple line chart but there are no lines connecting the data
points. I tried Format Data/Line and it showed that there was supposed to be
a line connecting the data points.

What should I check next?

Thanks in advance.

 

[Bob Umlas, Excel MVP]

I'd check both the color of the line (may be white) and the width of the line
(may be too small to see.

 

[jhaines]

Go to tools-option-chart and select 'plot empty cells as interpolated'