[Users] CCTK_Reduce sum reduction

[Jens Mahlmann]

Dear all,

I am currently encountering some strange behavior when using the 
CCTK_Reduce "sum" reduction. I observe that CCTK_Reduce would return a 
global "sum" (=0.06) which is between the global "minimum" (=0.0) and 
the global "maximum" (=6.6). In the global mode I am calling

CCTK_Reduce(cctkGH, -1, CCTK_ReductionHandle("sum"), 1,
           CCTK_VARIABLE_REAL,
           target_var, 1,
           CCTK_VarIndex("Thorn::source_var"))

Maybe somebody has an instant idea what I should look for to fix this to 
have the desired summation? Especially, I would be interested in summing 
up the values only on the finest refinement level. Is there a standard, 
best-practice way to do so?

Thank you very much and my best

Jens