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

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                                MAY   2013
      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  -13 -19 -22 -23 -30 -29 -33 -47  -44 -40 -42 -43 -51 -53 -49 -55  -60 -67 -72 -70 -65 -64 -65 -53
 2  -47 -54 -57 -53 -47 -42 -43 -37  -33 -37 -37 -32 -30 -29 -29 -28  -30 -29 -32 -33 -32 -30 -29 -26
 3  -25 -25 -23 -21 -22 -21 -21 -18  -17 -19 -19 -18 -17 -15 -16 -16  -16 -16 -16 -14 -17 -18 -18 -20
 4  -19 -17 -14 -13 -14 -15 -13 -13  -15 -15 -13 -13 -13 -13 -16 -15  -16 -18 -20 -25 -26 -23 -24 -27
 5  -27 -25 -23 -24 -25 -29 -33 -28  -25 -19 -14 -15 -14 -12 -11 -11   -3  -3  -5  -5  -5  -6  -4  -2

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

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

16    8   9   0  -4  -3  -5  -9 -11   -9  -6  -3  -6  -6  -4  10   1    8   0  -4 -12 -21 -24 -32 -35
17  -33 -28 -25 -26 -25 -25 -22 -16   -7  -3  -1  -4  -4  -1   4   3    1  -8  -7 -11  -9 -10 -15 -18
18  -18 -17 -32 -53 -61 -55 -52 -56  -61 -52 -44 -40 -35 -32 -27 -26  -25 -29 -34 -35 -34 -39 -44 -47
19  -46 -45 -43 -37 -34 -32 -32 -36  -38 -42 -44 -45 -46 -48 -51 -51  -49 -43 -38 -36 -36 -36 -34 -18
20  -14 -15 -14 -11 -10 -11 -12 -13  -14 -11  -8  -6  -7  -6  -6  -7   -8 -12 -11 -11  -9 -12 -14 -14

21  -12 -13 -15 -14 -15 -16 -16 -20  -16  -9  -9  -9  -9  -7  -8  -8   -7  -7  -8 -10 -11  -7  -4 -10
22  -13 -16  -8  -1   1  -1   2   8   11   9   1   5  12   8  12   9   -1  -7  -6  -6 -15 -18 -21 -15
23  -11  -8  -7 -10  -5  -6  -4  -5   -7  -9  -8  -5  -6  -3  -1  -4   -6  -7  -7 -10 -11 -15 -16 -14
24   -8  -5  -5  -4  -5 -10  -8  -7  -10 -16 -19 -18 -22 -27 -25 -21  -22 -20  -5 -11 -20 -27 -19 -19
25  -22 -21 -27 -41 -47 -58 -59 -51  -38 -30 -20 -36 -31 -28 -30 -37  -49 -55 -53 -56 -47 -51 -51 -42

26  -22 -11 -20 -30 -28 -43 -41 -41  -39 -41 -42 -41 -37 -35 -32 -30  -28 -28 -26 -32 -34 -36 -41 -37
27  -31 -28 -25 -30 -36 -33 -29 -29  -29 -26 -26 -20 -22 -26 -28 -24  -22 -21 -26 -30 -29 -27 -29 -29
28  -32 -34 -31 -34 -31 -27 -27 -26  -24 -28 -26 -23 -23 -24 -22 -21  -22 -23 -23 -22 -21 -22 -22 -20
29  -19 -19 -17 -15 -14 -15 -14 -15  -15 -16 -17 -19 -21 -21 -20 -19  -20 -19 -17 -16 -16 -17 -17 -15
30  -15 -16 -14 -12 -13 -13 -13 -12  -11 -11 -12 -11 -10 -10 -12 -12  -10  -7  -9 -10 -10 -11 -12 -11

31   -8  -6  -3   0   0  -4  -2   2    2  -1  -2  -5  -4  -4  -2  -1   10  16  14  11   9   6   6   5