Switch to the ‘Data’ Tab in the chart inspector
Click the ‘…’ button And SELECT THE ‘NEW CATEGORY’ OPTION
CLICK THE ‘…’ BUTTON AND SELECT THE Rename OPTION
Rename the category to ‘dataseries-1’
Click ‘Add New’ and select ‘Graph Line’
Assign a material and line thickness to the new Graph line
NOTE: For best performance , use a material with the shader “Chart/Canvas/Solid”