'closely between' is a correct and usable phrase in written English.
You can use it when you want to express proximity or similarity between two entities. For example, "The two restaurants are located very closely between each other."
Independent men split closely between Mr. Obama and the leading Republican candidates.
In fact, if you listen closely, between the "hell no's" and "you lie's," you can hear the pall of despair falling over them.
Two-thirds of Florida's G.O.P. voters said they supported the Tea Party, and they divided their votes closely between Mr. Romney and Mr. Gingrich.
The theory is generated from empirical observations of industry practice, including several case studies and many years of experience in working closely between academia and industry.
Specific energy costs for treatment of Madison Formation brackish and saline base cases and for seawater compared closely between the two models, with moderate differences for scenarios incorporating energy recovery.
I'm very much hoping to make that an integral part of the functions of the of department so that we are working very closely between basic and applied, each doing what we do well.... I'm actually very, very pleased.
Polls show them closely divided between the two candidates.
Undeclared voters and independents were more closely divided between candidates.
The voters are closely divided between Mr. Gore and Mr. Bush in the Tampa-St.
The committee is closely divided between 12 Democratic votes and 10 Republican votes.
While Republican voters preferred Mr. Romney, independents were closely divided between the top two candidates.
