Number of measurements available in each month during the year of 1997-2002

Location Month 1997 1998 1999 2000 2001 2002
HECA1 1 0 0 0 0 11 10
HECA1 2 0 0 0 0 8 10
HECA1 3 0 0 0 0 6 10
HECA1 4 0 0 0 0 7 5
HECA1 5 0 0 0 0 10 10
HECA1 6 0 0 0 0 7 10
HECA1 7 0 0 0 0 5 11
HECA1 8 0 0 0 0 10 10
HECA1 9 0 0 0 4 10 0
HECA1 10 0 0 0 10 11 9
HECA1 11 0 0 0 10 10 9
HECA1 12 0 0 0 10 10 6