ipv6 Next Header field

If my Next Header field as the protocol number 58 which is icmp. Where can I find the ICMP header, in the Extension Header?
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A value of 58 in the Next Header field of the basic IPv6 packet header identifies an IPv6 ICMP packet.

ICMP packets in IPv6 are like a transport-layer packet in the sense that the ICMP packet follows all the extension headers and is the last piece of information in the IPv6 packet.

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leblancAccountingAuthor Commented:
So ICMP header is in the Extension Header. Correct?
My understanding: Not "in". "Follows" it. That is "after" it.  

From the RFC: " Every ICMPv6 message is preceded by an IPv6 header and zero or more IPv6 extension headers."

Reference: < http://tools.ietf.org/html/rfc4443 >
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