Fix typos in manual

## Mapping of Fields to the Sensor Plane

![](./maps_types.png)\

*Examples for pixel geometries in field maps. The dark spot represents the pixel center, the red extend the electric field.

*Examples for pixel geometries in field maps. The dark spot represents the pixel center, the red extent the electric field.

Pixel boundaries are indicated with a dotted line where applicable.*

Fields are always expected to be provided as rectangular maps, irrespective of the actual pixel shape.

This algorithm results in a mean number of secondaries generated equal to

```math

<n_{total}> = \exp\left(\int_{x_0}^{x_n}\alpha(x)dx \right)

\langle n_{total}\rangle = \exp\left(\int_{x_0}^{x_n}\alpha(x)dx \right)

```

for sufficiently low step sizes.

\end{aligned}

```

## Original publication

### Original publication

The parameter values implemented in Allpix Squared are taken from Table 1 of \[[@okuto]\], using the values for silicon, as: