There are several line styles that you can include with your Excel Line Chart to make it stand out or tell a story.
You can adjust the WIDTH of the line to make it as thin or thick as you like.
You can make your line chart have a COMPOUND or DASH effect.
You can also add ARROWS at the start and end of the line chart, as well as make the chart have a SMOOTHED LINE effect.
See below how you can do this.