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(The monthly data in the wdc-like format is here.)

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                                MAY   2009
      unit=nT                                                                                      UT
      1   2   3   4   5   6   7   8    9  10  11  12  13  14  15  16   17  18  19  20  21  22  23  24
DAY
 1    4   5   7   8   8   8   6   5    3   2  -1  -1   0  -3  -5  -4   -3  -4  -3  -3  -2   0   2   0
 2   -1  -1  -3  -4  -3  -2  -4  -5   -5  -4   1   5   8   7   7   9    9   8   5   4   3   3   7   5
 3    2   4   7   8   8   5   3   4    3   0   0   0  -2  -3  -3  -3   -1  -1   0   1   3   5   7   4
 4    3   2   0   0   2   5   5   2    0   0  -5  -5  -5  -8  -7  -5   -3  -6  -7  -6  -5  -6  -5  -3
 5   -3  -3  -2   1   2   3   2   3    4   6   5   6   5   3   0   0   -1   4   7   8  10  10  11  15

 6   16  12   8   6   5   4   2   0   -2  -1   0   0   1   1  -1  -1    0   6   4  -4  -4  -3  -2  -3
 7   -5  -9  -7  -8 -11 -10 -11  -9   -9  -9  -8  -9  -9  -9  -9  -8   -7  -6  -7  -8  -2   2   1  -6
 8  -12 -12 -10 -11 -16 -26 -26 -26  -21 -19 -19 -19 -19 -19 -18 -17  -17 -19 -21 -24 -22 -19 -13 -10
 9  -10  -9  -7  -4  -6  -9  -6  -7   -9 -10 -14 -14 -11 -10 -12 -14  -15 -16 -17 -20 -20 -21 -18 -16
10  -15 -15 -14 -13 -11 -11 -11 -11   -8  -7  -7  -8  -8  -9 -12 -12  -10  -9 -10 -15 -16 -12  -8  -4

11   -7  -6  -6  -5  -5  -5  -6  -4   -6  -9  -9  -9 -11 -13 -14 -14  -14 -15 -15 -16 -15 -14 -11 -12
12  -11  -8  -6  -5  -6  -7  -6  -7   -7  -8  -8  -7  -6  -6  -5  -5   -5  -5  -6  -7  -7  -6  -4  -7
13   -7  -6  -1   0   1   1   3   4    0   0  -1   0   0   0   2   8    7   0   0  -1  -2  -1   1   1
14    1   1   1   1  -2   0   3   3    3   3   4   9  -4  -4  -3  -2    2   2 -10 -17 -19 -16 -11 -10
15   -8  -6  -3  -4  -6  -6  -3  -1    0  -2  -2  -4  -6  -5  -3  -5   -6  -7  -7  -6  -4  -3  -2  -2

16   -2  -2   0   0   0   2   5   6    5   4   2  -1  -2  -3  -4  -2   -3  -4  -4  -7  -5  -7 -10 -11
17   -9  -8  -6  -6  -6  -5  -3  -2   -2  -3  -5  -6  -6  -5  -3  -2   -3  -5  -5  -4  -2   2   6   5
18    4  -1  -1  -1  -2  -3   0   3    5   7   5   5   6   7   7   7    7   2  -1  -3   1   5   6   6
19    1   2   0  -2  -6  -8  -9 -10   -9  -7  -7 -10 -11 -12 -12 -10  -10 -11 -12 -11  -7  -2   3   4
20    4   5  10   7   7  10  10   9    9   8   6   5   6   7   8  11   11   7  11  12  12  11  12  15

21   20  18  15  13  11   9   7   5    5   5   2   1  -2  -2   2   4    3   2   0  -1  -3  -3  -2  -1
22    1   1   2   4   4   4   3   3    0  -4  -5  -9  -6  -7  -9  -9   -8  -9  -6  -7  -6   0   1   1
23    1   1  -2  -5  -7  -8 -10 -11  -10  -9  -7  -8  -8  -8  -7  -5    0   0  -5  -7 -10  -8  -6  -5
24   -6  -7  -5  -3  -3  -4  -6  -5   -4  -3  -4  -6  -6  -8  -6  -4   -4  -7  -8  -7  -4  -2  -1  -2
25   -4  -6  -4  -3  -2  -2  -2  -3   -3  -1  -1   1   2   2   3   5    4   0  -2  -3  -1  -6  -6  -5

26   -2   2   3   3   2   3  -1   0    4   6   7   7   4   0  -2  -1   -1  -1   1   1   0  -1  -2  -3
27   -4  -3  -2  -1   0  -1   0   0   -1   1   1   1   1   1   2   2    1   1   0   0   1   0  -2  -1
28    1   2   3   2   1  10  11  13    8   5  -4  -9 -10 -10  -9  -8  -10  -9  -7  -8  -8  -6  -5  -5
29   -5  -5  -4  -4   1   3   4   1    3   4   1  -3  -6  -7  -9  -7  -10 -12 -14 -17 -16 -15 -11  -9
30   -8  -7  -8  -8  -8  -6  -1   3    4   4   1  -1  -2  -1   0   1    2   0  -2  -3   0   4   7   8

31    6   3   1   3   5   5   4   3    3   4   6   5   3   2   3   4    3   2  -1  -4  -3  -3  -2  -3