Error in deflection for query points

[nicoguaro]

In the example 2(c). Changing units (Readme example) the deflection shown are:

• 0.004 m for 3 m. But it is closer to 0.0036.
• 0.003 m for 1 m. But it is closer to 0.0026.

[JesseBonanno]

Rounding for display purposes, not a mathematical error. Users can change units (using update_units method) if higher precision required.