I closed these late yesterday but then turned them off again over night. I've collected overnight spectra now and have re-closed the loops. I'll make comparisons with the HEPI L4Cs and the ISI T240s for evidence of minimal harm from the loops. Attached is the comparison--I'll examine it closer too but I think there are elevated areas with the loops on between 0.7 and 10hz. Maybe we can live with this or tune this out.