"Bernard Liengme" wrote in message
...
Could you use date&time as the x-values?
With your present data, insert a new C column
In C1 enter =A1+B1 and format with Custom Format mm/dd/yy hh:mm (or
dd/mm/yy hh:mm if Canadian or British)
Now make an XY chart with columns B and C. It will look better with more
than 4 data points.
best wishes from (Old)Bernard
--
Bernard V Liengme
www.stfx.ca/people/bliengme

Thanks for your prompt reply Bernard.

Your solution was effectively the same as the "simplified??" description in
my original post and thankfully confirmed that I was on the right track!

Armed with your confirmation I looked even more closely at my data and
realised, for the first time, that some of the time intervals (timestamped
automatically by my BP monitor) were well under a minute apart. This
explained why some of my chart points were a couple of pixels wider than the
norm as the points were being correctly plotted but on top of each other!

Manually editing the times to adjacent minute intervals solved my problem.

Thanks again for your help.

Regards,

--
Fred