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Figure 4: Types of muffle feature


a - Segment of muffle wall with a prop type buttress


b - Segment of muffle wall with a bar type buttress


c - Segment of muffle wall with a tear drop buttress


d - Segment of muffle wall with a cornice type peripheral shelf


e - Segment of muffle wall with a step type peripheral shelf


f - Segment of muffle wall with a ridge deflector