[Groff] bold greek, e.g. sigma ?

groff

Is it possible to have bold greek letters?
Simply using
.EQ
bold sigma
.EN

doesn't seem to work.

Please advise

Thanks

Anton

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[Groff] bold greek, e.g. sigma ?, Anton Shterenlikht <=
- Re: [Groff] bold greek, e.g. sigma ?, Tadziu Hoffmann, 2014/06/03
  - Re: [Groff] bold greek, e.g. sigma ?, Anton Shterenlikht, 2014/06/03
    - Re: [Groff] bold greek, e.g. sigma ?, Ted Harding, 2014/06/03
    - Re: [Groff] bold greek, e.g. sigma ?, Tadziu Hoffmann, 2014/06/04