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! i_show_pv.ima
!
!   Support for SHOW PV ?[?]
!   adapted for IMAGER from i_show.ima 
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!
if spacing[1].eq.spacing[2]  let spacing[2] 'spacing_rule%c' 
!
say " SHOW PV will show a Position-Velocity plot"
say " "
!
!
!
say " "
say "  Displayed field size   "'ansi%blue'"SIZE"'ansi%none'"        [" 'bold''size[1]' 'size[2]''norm' "]         "'box%sunit'
say "  Field center           "'ansi%blue'"CENTER"'ansi%none'"      [" 'bold''center[1]' 'center[2]''norm' "]         offset "'box%sunit'
say "  Velocity Span          "'ansi%blue'"SPAN"'ansi%none'"           [" 'bold''span[1]' 'span[2]''norm' "]    (in axis units)"
say "  Cross size at center   "'ansi%blue'"CROSS"'ansi%none'"       [" 'bold''cross''norm' "]           in arcsec, 0 ==> none "
say " "
say "  Colour Scale range     "'ansi%blue'"SCALE"'ansi%none'"       [" 'bold''scale[1]' 'scale[2]''norm' "]         [0 0] ==> all dynamic"
say "  Contour levels         "'ansi%blue'"SPACING"'ansi%none'"     ["  'bold''spacing[1]'" "'spacing[2]''norm'"]       [Value Unit] [0 0] ==> Guess"
say "  Spacing type           "'ansi%blue'"SPACE_TYPE"'ansi%none'"  ["  'bold''space_type''norm'" ]         [LIN, LOG or USER]"
!
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if ("a&1".ne."a??") return
say " "
say "  Display the header     "'ansi%blue'"DO_HEADER"'ansi%none'"   [" 'bold''do_header''norm' "]   "
say "  Display a color wedge  "'ansi%blue'"DO_WEDGE"'ansi%none'"    [" 'bold''do_wedge''norm' "]     "
say "  Plot bitmaps           "'ansi%blue'"DO_BIT"'ansi%none'"      [" 'bold''do_bit''norm' "]         "
say "  Display the labels     "'ansi%blue'"DO_LABEL"'ansi%none'"    [" 'bold''do_label''norm' "]     "
say "  Display contour levels "'ansi%blue'"DO_CONTOUR"'ansi%none'"  [" 'bold''do_contour''norm' "] "    
say "  grey-scale contours    "'ansi%blue'"DO_GREY"'ansi%none'"     [" 'bold''do_grey''norm' "] "
say "  Better marks           "'ansi%blue'"DO_MASK"'ansi%none'"     [" 'bold''do_mask''norm' "]          (Hide image behind channel marks)"
say " "
!
!say "                         [SPACE_TYPE = "AUTO"  or  SPACING =0 ==> automatic determination]"
!say "                         [SPACE_TYPE = "EXPO"  and SPACING >=0 ==> logarithmic levels]"
!say "                         [SPACE_TYPE = "NATIVE"  and SPACING >0 ==> levels equally spaced by the value of SPACING units]"
!say "                         [SPACE_TYPE = "NOISE" and SPACING >0 ==> levels equally spaced by the value of SPACING sigmas]"
!say "                         [SPACE_TYPE = "USER"  or  SPACING <0 ==> manually use LEVELS command]"
say "  Automatic colour scale "'ansi%blue'"SHOW_COLOR"'ansi%none'"  ["  'bold''show_color''norm'"] " 

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