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D.4 Global definitions

Definitions to be used throughout the region file are placed on a line beginning with ’global’, usually at the top of the file. These definitions may also be used on any individual region or annotation line; in this case, the value defined on that line will override the predefined global (but only for that line). If a ’global’ line occurs later in the file, subsequent lines will obey those definitions.

• Coordinate reference frame:
  • Possible values: J2000, JMEAN, JTRUE, APP, B1950, B1950_VLA, BMEAN, BTRUE, GALACTIC, HADEC, AZEL, AZELSW, AZELNE, AZELGEO, AZELSWGEO, AZELNEGEO, JNAT, ECLIPTIC, MECLIPTIC, TECLIPTIC, SUPERGAL, ITRF, TOPO, ICRS
  • Default: image value
    

    coord = J2000

• Frequency/velocity axis:
  • Possible values: REST, LSRK, LSRD, BARY, GEO, TOPO, GALACTO, LGROUP, CMB
  • Default: image value
    

    frame=TOPO

• Frequency/velocity range:
  • Possible units: GHz, MHz, kHz, km/s, Hz, channel
  • Default: image range
    

    range=[min, max]

• Correlation axis:
  • Possible values: I, Q, U, V, RR, RL, LR, LL, XX, XY, YX, YY, RX, RY, LX, LY, XR, XL, YR, YL, PP, PQ, QP, QQ, RCircular, LCircular, Linear, Ptotal, Plinear, PFtotal, PFlinear, Pangle
  • Default: all planes present in image
    

    corr=[X, Y]

• Velocity calculation:
  • Possible values: RADIO, OPTICAL, Z, BETA, GAMMA
  • Default: image value
    

    veltype=RADIO

• Rest frequency:
  • Default: image value
    

    restfreq=1.42GHz

• Line characteristics:
  • Possible values: any line style recognized by matplotlib: ’-’=solid, ’--’=dashed, ’:’=dotted
  • Default: linewidth=1, linestyle=’-’
    

    linewidth=1
    linestyle=’-’
    

• Symbol characteristics:
  • Symbol syze and thickness:
    

    symsize = 1
    symthick = 1

• Region, symbol, and text color:
  • Possible values: any color recognized by matplotlib, including hex values
  • Default: color=green
    

    color=red

• Text font characteristics:
  • Possible values: see Sect. D.7.2.
  • ’usetex’ is a boolean parameter that determines whether or not the text line should be interpreted as LaTeX, and would require working LaTeX, dvipng, and Ghostscript installations (equivalent to the text.usetex parameter in matplotlib).
    

    font=Helvetica
    fontsize=10pt
    fontstyle=bold
    usetex=True/False
    

• Label position:
  • Possible values: ’left’, ’right’, ’top’, ’bottom’
  • Default: ’top’

    labelpos=’right’

• Label color:
  • Default: color of associated region.
  • Allowed values: same as values for region colors.

    labelcolor=’green’

• Label offset:
  • Default: [0,0].
  • Allowed values: any positive or negative number, in units of pixels.

    labeloff=[1, 1]

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