See the spec:

https://www.w3.org/TR/sparql11-results-csv-tsv/#tsv

It's on purpose. TSV writes everything in a form parsable to extract the kind of the term (URI, literal, bnode, variable) terms and variables in syntax form.

        Andy

On 15/05/17 09:21, Laura Morales wrote:
It looks like that when the output format is set to TSV, variables name retain the "?" 
symbol, for example "?name". I don't know if this is on purpose or if it's a bug, because 
all other formats get rid of the ? symbol.

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