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Daily Mean Sunspot Numbers, Ra for April 1999

DayMn. Raw Ras.d.       Mn. Rak  s.d.
1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31
138

132

125

94

81

71

88

76

72

73

96

108

145

173

204

177

168

149

148

152

152

135

133

136

141

150

162

156

166

154

120
7.8

6.0

8.7

7.0

4.3

7.9

5.9

6.4

5.4

5.7

6.1

8.8

9.3

14.4

13.7

13.6

9.1

12.0

9.3

8.9

9.5

9.6

7.7

11.1

11.8

14.4

13.7

13.4

11.7

8.7

7.5
  106

101

95

72

60

52

68

57

58

54

73

79

111

136

162

142

136

117

113

118

117

111

102

106

106

115

124

117

119

118

93
5.3

4.0

6.4

4.2

2.8

4.9

4.0

4.4

3.4

3.5

3.4

5.1

5.2

6.8

8.2

9.0

5.2

6.5

4.7

5.4

6.9

6.1

5.0

6.8

6.7

9.6

6.8

5.5

6.4

5.8

5.4
Means:131.5  101.2 
No. of Observations: 687
No. of Observers: 55

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