Where is the file extent map ?

hello everybody,
I have a question. In Oracle Cluster, when Database Instace want to do I/O on a database file stored in ASM it first have to interactive with ASM instance. ASM Instace will provide Database Instance with ASM File Extent Map . ASM File Extent Map will show Database Instance where file's extents . After that Database Instance can perform direct I/O to the Database File. So where is the ASM File Extent Map ?What store ASM File Extent Map ? somebpdy can tell me ???

A complete list in https://twiki.cern.ch/twiki/bin/view/PSSGroup/ASM_Internals
N.A.     X$KFFXP     extent map table for all ASM files     
N.A.     X$KFDAT     extent list for all ASM disks     
N.A.     X$KFBH     describes the ASM cache (buffer cache of ASM in blocks of 4K (_asm_blksize)

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