Gnuplot ignoring missing data

Mac Sierra + latest patches (it won't go any further), Gnuplot 5.2 p6.

Have a look at www.horsfall.org/spamlog.pdf and note the weirdness at the end; 
there is missing data there thanks to my ISP cutting my fibre and taking ages 
to fix it (great anti-spam measure, I suppose).

In my spamlog.gp, I have:

     set datafile    missing "x"
     ...
     plot datafile using 1:($2)       lt rgb "red"    title 'Reject', \
     ...

Sample line from spamlog.dat:

     2019/04/26      x x x x x x x x x
     (Actually tabs, not spaces)

Have I misunderstood what "missing" means?  It's been a while since I studied 
stats...  My understanding is just that: missing data, hence leave a hole in 
your graph (indistinguishable from zero in my case, but I can handle that).

A message on StackOverflow also says that the above should work and not draw a 
line across it (not that I trust StackOverflow anyway), but that's exactly what 
Gnuplot is doing.

Thanks.

-- Dave


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