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How to calculate microstrip gap capacitance?

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Terminator3

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I read that if gap is large, then effect of capacitor can be ignored. But to understand quantities i want to know approximate capacitance depending on gap size. For example, for 50Ohm line with gap size of 0.1, 0.2, 0.3 mm etc.. I found something for coupled lines, but it is unclear how to use it for simplier gap
 

the formula for gaps was presented in many microstrip book by Bahl and others
 
a proper model for a gap is a series capacitance, with shunt capacitances on either side. The shunt capacitances become important in some cases.
 
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