psxy and segment headers

I'm trying to implement the mods that Christian Heine
(http://tectonicwaters.wordpress.com/2012/06/28/plate-boundaries-for-gmt5s-p
sxy/) has done to Peter Bird's tectonic plates file
(peterbird.name/oldFTP/PB2002/). 
The -Sf section headers are meant to create the various symbols for each
type of plate boundary. 

The command is meant to be:
 psxy -J -R PB2002_boundaries.gmt -W0.5p,red -O -Sf0.25/3p -Gred
-Ba30:."Bird's_Plate_Boundaries" >> out.ps

But all I get is:
 psxy: Warning: # not a valid number and may not be decoded properly.
 psxy: Mismatch between actual (2) and expected (3) fields near line 22

Here is a snippet of the relevant bit of the file (with line numbers)
18:	#
19:	#
----------------------------------------------------------------------------
#
20:	> AF-AN Mueller et al. [1987]   
21:	> -Sf0.45/3p
22:	-0.4379 -54.8518

It appears to be recognising segment headers OK. gmtdefaults shows:
  IO_SEGMENT_MARKER               = >

What else is it expecting?

I'm using 5.1.0

RussC

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