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From: Uwe Brauer <oub@mat.ucm.es>
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Subject: registry and the gnus-summary-line-format
Date: Sun, 19 Feb 2017 21:45:13 +0000
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Hi according to the documentation of gnus-registry.el
I should add ;; Finally, you can put %uM in your summary line format to
show the registry.

now in the relevant custom buffer using  gnus-group-customize
I have 

Set variables local to the group you are entering. More
INS DEL Variable: gnus-summary-line-format
            Value: 
"%uM%U%R%z%I%N %(%[ %-10,10uB%]%) %-10,10~(form (rfc2047-decode-string (gnus-extra-header 'To)))@  [%-25,25s%] %D %k %L   \n"
INS

but gnus-summary-line-format is a variable defined in ‘gnus.el’.
Its value is "%U%R%z%I%(%[%4L: %-23,23f%]%) %s
"

I don't understand that, can somebody please explain?

thanks

Uwe Brauer