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±I ±I
first short stroke
long stroke
positive or negative t positive or negative t
–I –I
subsequent short strokes
negative t negative t
Figure 2.1.7 Possible components of a downward flash
±I superimposed ±I
short strokes
short stroke
first long long stroke
stroke
positive or negative t positive or negative t
–I –I
subsequent
short strokes
negative t negative t
±I
single long
stroke
positive or negative t
Figure 2.1.8 Possible components of an upward flash
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