SMPS_Total_cm3	The total concentration of aerosol particles from the SMPS (32-829 nm) in particles per cm3
SMPS_Time_sec	The SMPS time in seconds
SP2_Total_cm3	The total concentration of refractory black carbon particles (90-500 nm VED) from the SP2 in particles per cm3
SP2_Time_sec	The SP2 time in seconds
