Translate the given Spanish text to English

The quantity of the resulting dye to be applied is between 0.1 ml and 20 ml.
La cantidad del colorante resultante a aplicar se sitúa entre los 0,1 ml y los20 ml.

The center ferquency is tuned by varying the width of the trace.
La frecuencia central es sintonizada mediante variacion de la anchura de la pista.

There are a plurality of each type of fibrous layers.

Existen pluralidades de cada tipo de capas fibrosas.

