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

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                                MAY   2008
      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  -12 -10  -7  -5  -4  -4  -8  -6   -8 -10  -8  -6  -5  -5  -4  -3    3   4   4   6   6  -5 -20 -23
 2  -22 -13  -6  -2  -5 -14 -16 -15  -14 -13 -13 -12 -15 -18 -20 -17  -12 -10 -11 -10  -9  -6  -8  -6
 3   -8 -11  -8  -9 -10 -10 -12 -10  -12 -21 -16  -9  -8 -10  -8  -5   -2   1   0  -6  -9  -9 -10  -8
 4   -7  -5  -7  -9 -13 -14 -13 -15  -16 -13 -15  -9  -6  -6  -9  -8  -10 -12 -10  -7  -5  -8 -11 -11
 5   -9  -8  -5 -11 -13 -13 -13 -19  -15 -13 -10  -8  -8 -11 -14 -17  -15 -12 -18 -24 -24 -22 -19 -18

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

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

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

21   -3  -8 -15 -28 -29 -26 -24 -19  -15 -11 -11  -8  -6  -8  -8  -8   -5  -6  -9  -9  -9 -10 -12 -17
22  -23 -26 -24 -24 -22 -21 -16 -12  -11 -10  -8  -7 -10 -12 -13 -12   -8 -14 -14 -16 -12 -10 -14 -13
23  -10  -9 -11  -7  -5  -7  -8  -8   -6  -5  -7 -10 -12 -15 -16 -13  -11 -10  -9 -14 -12 -11 -13 -15
24  -13 -14 -10  -7  -7  -7  -9 -13  -16 -17 -15 -11 -13 -12 -10 -11  -10  -9  -8  -8 -10 -15 -20 -21
25  -20 -16 -15 -14 -11 -12 -13 -10   -6  -7  -8  -7  -4  -5  -4  -4   -5  -6  -7  -7  -6  -7  -7  -7

26   -7  -6  -6  -6  -9  -9  -8  -8   -8  -8  -9 -10 -12 -12 -13 -13  -13 -12 -10  -7  -5  -7  -9 -11
27  -13 -12 -12  -9  -8  -7 -10 -11   -9  -6  -5  -5  -5  -7  -7  -5   -3  -3  -2   4   6   4  -2   0
28    0  -2   6  12  16  10   4  -5  -11  -6  -3  -3  -4  -8 -10 -11  -16 -16 -13 -14 -13 -11 -10 -12
29  -13 -10  -9  -6  -8  -8 -11 -10   -4  -2  -1  -1  -2  -8 -11  -4   -1  -1  -3  -4  -3  -7  -7  -5
30   -6 -13 -20 -17 -15 -13 -12 -11   -8  -5  -1   0  -2  -1  -7 -16  -14 -14  -9  -4  -4  -5  -8  -8

31   -9 -10  -9  -8 -10 -14 -21 -20  -14 -10  -7 -13  -5  -6 -10 -11  -12 -15 -14 -13 -12 -12 -10  -7