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#define QUOTE(var1) #var1 #define DOUBLES(var1, var2) var1##_##var2 #define ADDON test #define GVAR(var1) DOUBLES(ADDON, var1) #define QGVAR(var1) QUOTE(GVAR(var1)) if (!isNil QGVAR(magnification)) exitWith{0.25/GVAR(magnification)};