1870-1879 MONTHLY VOLCANIC FORCING IN 45-DEGREE-LAT BANDS FROM N TO S
    5    5    5    5    5    5    5    5    5    5    5    5
    5    5    5    5    5    5    5    5    5    5    5    5
    5    5    5    5    5    5    5    5    5    5    5    5
    5    5    5    5    5    5    5    5    5    5    5    5
    5    4    4    4    4    4    4    5    5    6    6    7
    5    4    4    4    4    4    4    5    5    6    6    7
    5    4    4    4    4    4    4    5    5    6    6    7
    5    4    4    4    4    4    4    5    5    6    6    7
    7    8    8    9    9    9   11   13   15   17   19   21
    7    8    8    9    9    9   11   13   15   17   19   21
    7    8    8    9    9    9   11   13   15   17   19   21
    7    8    8    9    9    9   11   13   15   17   19   21
   23   25   27   29   31   33   33   32   31   30   28   27
   23   25   27   29   31   33   33   32   31   30   28   27
   23   25   27   29   31   33   33   32   31   30   28   27
   23   25   27   29   31   33   33   32   31   30   28   27
   26   24   23   22   21   19   17   15   12    9    7    4
   26   24   23   22   21   19   17   15   12    9    7    4
   26   24   23   22   21   19   17   15   12    9    7    4
   26   24   23   22   21   19   17   15   12    9    7    4
    5    1    1    1    1    1    1    1   20   50   79  109
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
  139  168  198  228  257  287  298  291  283  276  269  261
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
  254  247  239  232  225  217  210  202  194  186  177  169
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
  161  153  145  137  129  121  115  112  108  105  101   98
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
   94   91   88   84   81   77   74   71   68   65   61   58
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1

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  NOTE: data in (12 months) by (4 lat-zones) by (10 years)
        to get actual values of optical depth use a factor of 1.e-4