end of COPY

Hi,

on a Postgres 16 DB running on a redhat 8.5 x86 machineI want to input some data using copy from stdin

so.. more that 700 000 lines goes well.

Then the flow contains a single line: \.

to my understanding this means end of the copy 

but, Postgres generates an error :

invalid input syntax for type numeric "\."

then the 2 lines stating the copy command that was executed.

what am I missing ?

thanks