/usr/share/doc/ruby-gsl/examples/fft/sunspot.dat is in ruby-gsl 2.1.0.3+dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 | 1716 47.0
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1746 22.0
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1750 83.4
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1752 47.8
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1756 10.2
1757 32.4
1758 47.6
1759 54.0
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1761 85.9
1762 61.2
1763 45.1
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1765 20.9
1766 11.4
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1769 106.1
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1787 132.0
1788 130.9
1789 118.1
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1798 4.1
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1800 14.5
1801 34.0
1802 45.0
1803 43.1
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1809 2.5
1810 0.0
1811 1.4
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1889 6.3
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1906 53.8
1907 62.0
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1909 43.9
1910 18.6
1911 5.7
1912 3.6
1913 1.4
1914 9.6
1915 47.4
1916 57.1
1917 103.9
1918 80.6
1919 63.6
1920 37.6
1921 26.1
1922 14.2
1923 5.8
1924 16.7
1925 44.3
1926 63.9
1927 69.0
1928 77.8
1929 64.9
1930 35.7
1931 21.2
1932 11.1
1933 5.7
1934 8.7
1935 36.1
1936 79.7
1937 114.4
1938 109.6
1939 88.8
1940 67.8
1941 47.5
1942 30.6
1943 16.3
1944 9.6
1945 33.2
1946 92.6
1947 151.6
1948 136.3
1949 134.7
1950 83.9
1951 69.4
1952 31.5
1953 13.9
1954 4.4
1955 38.0
1956 141.7
1957 190.2
1958 184.8
1959 159.0
1960 112.3
1961 53.9
1962 37.5
1963 27.9
1964 10.2
1965 15.1
1966 47.0
1967 93.8
1968 105.9
1969 105.5
1970 104.5
1971 66.6
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