1920-1929 MONTHLY VOLCANIC FORCING IN 45-DEGREE-LAT BANDS FROM N TO S
    1    1    1   30   70  100  140  170  160  140  130  110
    1    1    1   30   70  100  140  170  160  140  130  110
    1    1    1   30   70  100  140  170  160  140  130  110
    1    1    1   30   70  100  140  170  160  140  130  110
  100   80   70   60   40   30   10    1    1    1    1    1
  100   80   70   60   40   30   10    1    1    1    1    1
  100   80   70   60   40   30   10    1    1    1    1    1
  100   80   70   60   40   30   10    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    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    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    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
   51   45   55   56   56   64   80   75   68   69   66   63
   51   45   55   56   56   64   80   75   68   69   66   63
    1    1    1    1    1    1    1    1    1    1    1    1
    1    1    1    1    1    1    1    1    1    1    1    1
   58   52   61   60   68   62   56   41   20    1    1    1
   58   52   61   60   68   62   56   41   20    1    1    1
    1    1    1    1    1   29   36   46   39   36   36    1
    1    1    1    1    1   29   36   46   39   36   36    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    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    1
    1    1    1    1    1   31   31   32   42   41   40   47
    1    1    1    1    1   31   31   32   42   41   40   47
   21   36   45   56   69   84   97  111   97   91   94  119
   21   36   45   56   69   84   97  111   97   91   94  119
   49   62   76   75   82   81   90  101  103   99   94   88
   49   62   76   75   82   81   90  101  103   99   94   88
  121  136  130  122  113  113  115  113  104   94   90   80
  121  136  130  122  113  113  115  113  104   94   90   80

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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