ed residuals sum. If some point occurs more than once, then it influences the sum more. That's how you do weighted approximation. You can add weights to your points by multiplying them.
	</p>
	</div>

	<h2>
Interpolation
	</h2>
	<p>
The word <i><span id="index_interpolation">interpolation</span></i> also comes from Latin and it roughly translates as “smoothing things in between”. When you have a set of points, you use interpolation to find values between these points.
	</p>
	<p>
With <span id="index_pol