VOLCANIC DUST VEIL INDEX, NORTHERN HEMISPHERE, 1500-1969 200 150 100 50 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 50 50 50 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 500 350 200 100 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 200 150 100 50 0 0 0 200 150 100 50 40 30 20 10 400 300 210 110 10 20 50 50 50 40 30 20 10 200 150 100 50 0 0 0 0 0 0 0 100 75 50 25 0 0 120 90 60 30 0 40 30 120 85 150 400 275 175 75 0 60 45 30 15 100 75 50 25 0 0 0 0 0 0 340 255 170 85 130 100 65 30 0 0 0 0 200 150 100 50 0 0 0 0 280 210 140 70 0 0 0 0 0 0 0 0 0 140 285 205 105 45 0 0 0 0 0 0 0 0 0 300 225 150 75 0 80 60 40 20 0 120 90 60 30 100 75 50 55 15 15 15 15 15 160 130 90 50 0 0 0 0 0 0 0 0 0 0 60 45 30 15 0 0 0 0 200 150 160 255 150 95 40 80 110 77 45 13 0 0 0 0 0 0 0 0 50 37 25 13 0 0 0 180 135 90 45 400 300 200 160 45 30 15 0 0 0 0 0 120 130 90 50 130 90 60 30 0 0 0 0 0 0 0 0 80 180 170 170 695 490 375 195 30 15 0 200 150 100 70 80 65 50 75 50 200 130 80 40 525 450 375 300 225 150 75 0 0 0 100 205 140 90 30 0 0 0 0 0 0 140 105 70 35 0 160 120 80 40 0 0 0 160 120 80 40 0 0 0 120 90 60 30 0 0 0 0 400 300 240 170 50 170 125 85 45 20 15 10 5 0 0 30 25 15 5 180 135 90 45 0 60 45 30 15 0 60 45 30 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 160 120 80 40 0 0 0