Fig. 2
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Schematic representation of the massive circumstellar shell. The center of the explosion is coincident with the geometric center of the spherical shell. The Earth vantage point lies on the negative y-axis. In this representation the angles in Eq. (1) are θ = 30° and ϕ = 0 and the shell has the maximum density in the NW quadrant and the minimum density in the SE quadrant.
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