AK_GRNC: - UNKNOWN - UNKNOWN
http://anf.ucsd.edu/api/ta_prelim/rrd/plot/?sta=GRNC&chan=dt&net=AK&tw=d
http://anf.ucsd.edu/api/ta_prelim/rrd/plot/?sta=GRNC&chan=dt&net=AK&tw=w
http://anf.ucsd.edu/api/ta_prelim/rrd/plot/?sta=GRNC&chan=dt&net=AK&tw=m
http://anf.ucsd.edu/api/ta_prelim/rrd/plot/?sta=GRNC&chan=dt&net=AK&tw=y
http://anf.ucsd.edu/api/ta_prelim/rrd/plot/?sta=GRNC&chan=dt&net=AK&tw=l