This is an example of Vue Chart tooltips formatting. The formatting is done with the toolTipCustomFormatFn function.
U.S. Stock Market Index Performance (2014)
NASDAQ Composite compared to S&P 500
1-Jan-2014
1-Mar-2014
1-May-2014
1-Jul-2014
1-Sep-2014
1-Nov-2014
1-Jan-2015
S&P 500
NASDAQ
Daily Closing Price
1500
2000
2500
3000
3500
4000
4500
5000