List of intervals of 320ms data deleted because their 15.36s averages 
 and long-available 15.36s data were both judged to be spurious.   
 cf. section E of readme at 
ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/imp/imp8/mag/320ms_ascii/doc/imp8_mag_320ms_proc.txt 

---------------------
1973 344.410  344.850
1973 350.680  350.760
1978 182.000  182.700
1982 073.000  079.000
1983 057.660  057.680
1985 162.000  168.730
1992 146.420  146.440
1993 044.690  044.698
1993 065.520  065.540
1993 066.850  066.880
1993 093.400  093.470
1993 226.280  226.315
1994 006.540  006.605
1994 194.610  194.622
1997 026.720  026.750
1999 153.915  153.930