MS Excel Secrets - Improving Chart Formats
http://ingenuitydias.blogspot.com/2014/03/ms-excel-secrets-improving-chart-formats.html
- Remove any vertical grid-lines.
- Change horizontal grid-line colours from black to a very light shade of Gray.
- Adjust chart series colours to get better contrast.
- Adjust font scaling (for versions excel 2003 and prior).
- Add data labels and remove any axis (axis labels) if needed.
- Remove chart background colours.