ASTMInternational grants permission to reproduce the attached figure on Wikipedia and Wikimedia Commons as requested below provided the following credit line is used: Reprinted, with permission, from E3134-17 Standard Specification for Transportation Tunnel Structural Components and Passive Fire Protection Systems, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be obtained from ASTM International,
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