POTENT[Epoch=14363] (-Volts) aggregation timerange is explicit
POTENT[Epoch=14363] (-Volts) aggregation timerange inferred from URI
POTENT[Epoch=14363] (-Volts) trim implemented by hand
BFIELD__3[Epoch=8610] (nT) cdaweb timerange is explicit
BFIELD__3[Epoch=8610] (nT) cdaweb timerange inferred from URI
