.HELP:
This text plotting routine simulates DCL RUNOFF procedure to setup a text
page. As in DCL RUNOFF, a command line must start with a dot "." at the 
1st column but no text can follow it. Following runoff_like commands are 
implemented:

 Full_name                    Short_hand              Program default
-------------------------    --------------------    -------------------
.PAGESIZE width,height       .PS width,height         .PS 8.0,5.0

     Set page size in inches.

.SCALE x,y_scale_factor      .SC x,y_scale-factor     .SC 1.0,1.0

     Set overall plot scale factors. If you specify a pagesize beyond
     the screen size (10.0x8.0 inches), use smaller scale factors to
     shrink the page so that you can better preview the page setup.

.TOPMARGIN margin            .TM margin               .TM 1.0

     Set page top margin in inches.

.LEFTMARGIN margin           .LM margin               .LM 0.5

     Set page left margin in inches.

.SPACING line_spacing        .SP line_spacing         .SP 0.15

     Set line spacing in inches for subsequent text lines.

.FONT keyword                .FT keyword              .FT standard

     Select font type for subsequent text lines where the valid
     font keywords are STANDARD, ITALICS, and BOLDFACE.

.SIZE width,height           .SZ width,height         .SZ 0.15,0.15

     Set text character width and height in inches.

.COLOR keyword               .CL keyword              .CL green

     Set drawing pen color for subsequent text lines
     where the valid color keywords are
     BLACK/WHITE, RED, GREEN, BLUE, MAGENTA, PURPLE, YELLOW

.RESET x,y_coordinate        .RS x,y_coordinate

     Re_position drawing pen to screen coordinate (x,y) in inches.
     Coordinate (0.0,0.0) is on top_left corner of the screen with
     positive x cross and positive y down the screen. RESET command
     is used mainly for drawing multi_columns of text or a table.
     A RESET command without x,y_coordinate resets drawing pen to
     the lowest or max y_coordinate ever referred to on the page.

.CENTER x_left,x_right       .CT x_left,x_right

     Begin centering for subsequent text lines between coordinate
     points x_left and x-right. If x_left and x_right are not
     specified, the text lines are centered on the page.
     Multi-column text centering can be accomplished combining
     CENTER with RESET command.

.ENDCENTER                   .EC

     Stop centering of text lines.

.HSPACE width                .HS width

     Set horizontal space or indentation to the right in inches
     for subsequent non_centering text lines.

.VSPACE height               .VS height

     Set vertical space in inches between the last text line
     and the subsequent text lines.

.LINE x1,y1,x2,y2,line_type       .LI x1,y1,x2,y2,line_type

     Draw a line of specified type from point (x1,y1) to (x2,y2)
     where the coordinates are in inches and refer to top_left
     corner (0.0,0.0) of the screen.
     Following line types are available:

         1> solid line.              2> short-dash line.
         3> medium-dash line.        4> long-short-dash line.
         5> dot-dash line.           6> 1-dot-center line.
         7> 2-dot-dash line.         8> 3-dot-dash line.
         9> dotted line.

.NEWPAGE                     .NP

     Start a new page for subsequent text lines.
--------------------------------------------------------------------
Following control sequences can be embedded within a text line:

     { --- Convert the next non-blank character to superscript.
     } --- Convert the next non-blank character to subscript.

     \sTEXT_STRING^s  --- TEXT_STRING to be italics.
     \bTEXT_STRING^b  --- TEXT_STRING to be boldface.
     \#TEXT_STRING^p  --- TEXT_STRING to be colored in pen code #.
.MENU:
0: Exit to the main menu.
1: Invoke hardcopy making utility.
   If you just get back from auxiliary layout and would like
   to have the changes just made in the layout to show up on
   the hardcopy, redraw the plot before invoking the hardcopy.
2: Invoke auxiliary layout utility.
3: Plot another file.
4: Plot the next page if any.
5: Plot the previous page if any.
6: Redraw the current page.
$: Spawn a system subprocess.
PF1: Invoke hardcopy making utility without the page setup menu.
PF2: Invoke this help menu.
PF3: Plot another file.
PF4: Spawn a system subprocess.
