Für die x- Achse ist das ganz simpel:
$$ X= \frac{1}{\left(1-\frac{d_e}{d_0}\right)^2} $$
$$ \frac{\partial \, X}{\partial \, d_e}= \frac{2 \, d_0 ^2}{\left(d_0-d_e\right)^3} $$
$$ \frac{\partial \, X}{\partial \, d_0}= \frac{2 \, d_0 \, d_e}{\left(d_0-d_e\right)^3} $$
$$ \Delta X = \sqrt{\left( \frac{\partial \, X}{\partial \, d_e} \cdot \Delta d_e \right) ^2 + \left( \frac{\partial \, X}{\partial \, d_0} \cdot \Delta d_0 \right) ^2 } $$
$$ \Delta X = \sqrt{\left( \frac{2 \, d_0 ^2}{\left(d_0-d_e\right)^3} \cdot \Delta d_e \right) ^2 + \left( \frac{2 \, d_0 \, d_e}{\left(d_0-d_e\right)^3}\cdot \Delta d_0 \right) ^2 } $$
alles klar ?