# Variable capacitor notation with a division sign (e.g. 2÷10p)

In this schematic, there is an unfamiliar notation for the variable capacitors using and division sign or obelus, for example 2÷10p (red), as opposed to, e.g. 1p for a fixed capacitor (green).

I have presumed that this is used for indicating the number of air gaps in a rotary variable capacitor, as the total capacitance is the capacitance of one gap, divided by the number of gaps (or plates - 1):

$\frac{C_{one\ gap}}{n_{gaps}} = \frac{C_{one\ gap}}{n_{plates} - 1} = C_{total}$

Is this the correct interpretation?

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