How to edit legend labels in google spreadsheet plots? : <p>I'm trying to plot some data in Google spreadsheet:</p>

<p><a href="https://i.stack.imgur.com/qRAuF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/qRAuF.png" alt="enter image description here"></a></p>

<p>And as you may see all of the series are in a same column and I can't use the any of the rows as headers. My plot looks like this:</p>

<p><a href="https://i.stack.imgur.com/jBdry.png" rel="noreferrer"><img src="https://i.stack.imgur.com/jBdry.png" alt="enter image description here"></a></p>

<p>I would appreciate if you could help me know how I can edit/add legend labels.</p>
