The ICESPICE demonstrator for particle/ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si75.svg" display="inline" id="d1e1755"> <mml:mi>γ</mml:mi> </mml:math> - <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si135.svg" display="inline" id="d1e1760"> <mml:msup> <mml:mrow> <mml:mi>e</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> </mml:msup> </mml:math> coincidence experiments at Florida State University