.HTL 
demo of www.tmac problems
.HTML				\" to insert a blank line??
.NHR
.ce 2
\fBwww.tmac from groff 1.20.1\fP
.br
HTML created via \*Qgroff -Thtml test.txt > test.html\*U
.HR
.HnS 1
EPS files
.HnE
.HTML-IMAGE			\" an eps file
.PSPIC cross_box.eps 2i
.HTML-IMAGE-END
.ce 1
.ll 3i
An EPS file is centred when surrounded by .HTML-IMAGE ...  .HTML-IMAGE-END
.ll
.
.HTML-IMAGE-LEFT			\" an eps file
.PSPIC cross_box.eps 2i
.HTML-IMAGE-END
.ce 1
.ll 3i
An EPS file is left justified when surrounded by .HTML-IMAGE-LEFT ...  .HTML-IMAGE-END
.ll
.
.HTML-IMAGE-RIGHT			\" an eps file
.PSPIC cross_box.eps 2i
.HTML-IMAGE-END
.ce 1
.ll 3i
An EPS file is right justified when surrounded by
\&.HTML-IMAGE-RIGHT ...  .HTML-IMAGE-END
.ll

.HnS 1
DLS, OLS and ULS demo
.HnE
Only ULS/ULE are mentioned in the man page:
.ULS
.LI
ULS first line
.LI
ULS second line
.LI
ULS third line
.ULE
DLS/DLE is not mentioned.
.DLS
.LI
DLS first line
.LI
DLS second line
.LI
DLS  third line
.DLE
OLS/OLE is not mentioned either.
.OLS
.LI
OLS first line
.LI
OLS second line
.LI
OLS third line
.OLE
.HnS 1
IMG and PIMG
.HnE
The documentation says that \*QIMG\*U "includes a picture in a
document", but does not indicate the format (which turns out to be
PNG).  

It says the argument list has a length of four:
.OLS
.LI
-R, -L or -C
.LI
the file name
.LI
optional width (which defaults to 1 inch)
.LI
optional height (which defaults to the width)
.OLE

Unfortunately, arguments 1 and 2 are reversed in the macro, so the
following fails (the image is "PNG image, 611 x 611, 2-bit
colormap, non-interlaced" and is to be displayed as 
left justified, 2 inches wide) and doesn't display at all (.IMG
-L cross_box.eps001.ppm.png 2i):

.IMG -L cross_box.eps001.ppm.png 2i	\" left justified, 2 inch width

The following does work however.  The first two arguments are
reversed, and the width is declared in pixels as 305 611.  The
invocation is .IMG cross_box.eps001.ppm.png -L 305 611.

.IMG cross_box.eps001.ppm.png -L 305 611

Changing this to a right justified display (.IMG
cross_box.eps001.ppm.png -R 305 611) yields:

.IMG cross_box.eps001.ppm.png -R 305 611

Curious that it displays to the left again.  If I place the .IMG
macro command immediately after this line of text, it might go
the right place, but it didn't in this experiment.
.IMG cross_box.eps001.ppm.png -R 305 611

While constructing this demonstration,
I noticed that the left justified box did move to the right
when the macro invocation followed a line of text without any
intervening space (given that this line is long enough to wrap
around the image).
.IMG cross_box.eps001.ppm.png -L 305 611
Very curious, but of course it failed to repeat itself in this
experiment.

So on to PIMG.  I noticed that the argument list was identical,
but that the location parameters were optional.  But it didn't
work the same way.  Here is a sample PIMG invocation: .PIMG -R
cross_box.eps001.ppm.png 2.4i.
.PIMG -R cross_box.eps001.ppm.png 2.4i
This should result in a 2.4 inch wide image.  The macro seems to
have the width and height parameters selected incorrectly, so
that the following will work: .PIMG -R cross_box.eps001.ppm.png
dummy 2.4i.
.PIMG -R cross_box.eps001.ppm.png dummy 2.4i
And so will a centred version: .PIMG cross_box.eps001.ppm.png
dummy 2.4i.
.PIMG cross_box.eps001.ppm.png dummy 2.4i

I hope that this demo helps to clarify the comments in my
previous note.  If there is anything else I can do, please let me
know.