Coulomb's equation, used to define charge in these systems, is F = q 1 q 2 / r in the Gaussian system, and F = q 1 q 2 / (4 πr) in the HL system. The unit of charge then connects to 1 dyn⋅cm = 1 statC = 4 π HLC, where 'HLC' is the HL unit of charge. The HL quantity q describing a charge is then √ 4 π times larger than the corresponding Gaussian quantity. There are comparable relationships for the other electromagnetic quantities (see below).