1 CIMAGE Create a simple geometrical source model

        This  task  create an image which can be read from a file or created
    from a function.  The ouput filename is FILEO$.

    A- From a FILE:  if the logical variable IFILE$ is set to YES  an  image
    is  read from the input formatted file FILEI$ the column must ordered as
    :  x y z and expect to have standard gdf image  structure.   For  conve-
    nience, z should be in Brightness temperature, as for B case.


    B-  From a FUNCTION: If one of the function is activated a corresponding
    image using the parameters PARAMETERS$ will be created.   Intensity  are
    in Brightness temperature.


    E_DISK  : Elliptical Disk
    E_RING  : Elliptical Ring
    E_GAUS  : Elliptical Gaussian
    E_EXPO  : Elliptical Exponential
    RECT    : Rectangle
    POWER   : Power law
    PLAN    : Plan

    Convertion to Jansky is possible if variable JANSKY$ is set to YES.  The
    image can be mutiplied by a gaussian beam if BEAM$ is set to YES parame-
    ters are similar as for function GAUSS.

    ONLY  ONE  function  can be computed at the same time, Nevertheless more
    complex images can be produced using both CIMAGE and COMBINE tasks.



2 IFILE$
        TASK\LOGICAL "use an input FILE" IFILE$ Logical variable to  use  an
    input file

2 FILEI$
        TASK\CHARACTER  "input  FILENAME" FILEI$ Name of the input file used
    to create the gdf image

2 FILEO$
        TASK\CHARACTER "output FILENAME" FILEO$ Name of the output file

2 NXYV$
        TASK\INTEGER "ARRAY sizes" NXYV$[3] Array size : X Y V

2 SIZE$
        TASK\REAL "Image Size in arcsec" SIZE$ Image size lenght (")

2 SOURCE$
        TASK\CHARACTER "Source NAME" SOURCE$ Source name

2 LINE$
        TASK\CHARACTER "Line NAME" LINE$ Line name

2 FREQUENCY$
        TASK\REAL "Frequency (MHz)" FREQUENCY$ Line frequency in MHz

2 DF$
        TASK\REAL "Frequency Resolution (MHz)" DF$ Frequency  resolution  in
    MHz

2 E_DISK$
        TASK\LOGICAL "E_DISK " E_DISK$ Logical variable to compute an ellip-
    tical disk function : f(x,y)=> (x/a)^2+(y/b)^2<=1

2 E_RING$
        TASK\LOGICAL "E_DISK " E_RING$ Logical variable to compute an ellip-
    tical    ring    function    :   f(x,y)=>   (x/a)^2+(y/(a*e))^2>=1   and
    (x/b)^2+(y/(b*e))^2<=1

2 E_GAUS$
        TASK\LOGICAL "E_GAUS " E_GAUS$ Logical variable to compute an ellip-
    tical gaussian function as f(x,y)=Tb*exp(-4ln2*[(x/a)^2+(y/b)^2])

2 E_EXPO$
        TASK\LOGICAL  "EXPONENTIAL  " E_EXPO$ Logical variable to compute an
    exponential             decreasing             function               as
    f(x,y)=Tb*exp(-2^C.ln2*[(x/a)^c+(y/b)^c])  ;  note that for c=2 is equal
    to an elliptical beam

2 RECT$
        TASK\LOGICAL "RECT " RECT$ Logical variable to compute  a  rectangle
    function: f(x,y)=Tb  for  -a/2 < x < a/2
               and  -b/2 < x < b/2

2 POW$
        TASK\LOGICAL "POWER " POW$ Logical variable to compute a power func-
    tion as f(r)=Tb*(r/b)^c   ;  f(r<a)=f(a) ; f(r=b)=Tb

2 PLAN$
        TASK\LOGICAL "PLAN  " PLAN$  Logical  variable  to  compute  a  plan
    f(x,y)=ax+by+tb

2 PARAMETERS$
        TASK\REAL "Parameters: " PARAMETERS$[7]
     the 7 input  parameters are :

    FOR E_DISK,E_GAUS,RECT
        1,2     X,Y center relative coordinates (")
        3       Brightness Temperature (K)
        4       Position angle of the source (in DEGREES)
        5,6     Major(a) and Minor(b) axis (")
        7       not used

    FOR E_EXPO
        1,2     X,Y center relative coordinates (")
        3       Brightness Temperature (K)
        4       Position angle of the source (in DEGREES)
        5,6     Major(a) and Minor(b) axis (")
        7       radius's power

    FOR E_RING
        1,2     X,Y center relative coordinates (")
        3       Brightness Temperature (K)
        4       Position angle of the source (in DEGREES)
        5       ring inner equatorial radius     (")
        6       ring outer equatorial radius     (")
        7       flattening factor  (= polar/equatorial radius)

    FOR POW
        1,2     X,Y center relative coordinates (")
        3       Brightness Temperature (K)
        4       A: distance threshold  (")
        5       B: width               (")
        6       C: radius's power
        7       not used

    FOR PLAN
        1,2     X,Y center relative coordinates (")
        3       Brightness Temperature (K)
        4       Position angle of the source (in DEGREES)
        5,6     a,b plan equation coefficient  (1/")
        7       not used


2 JANSKY$
        TASK\LOGICAL  "  JANSKY  "  JANSKY$  Intensity scale convertion from
    Kelvin to Jansky if JANSKY$ is YES

2 BEAM$
        TASK\LOGICAL " BEAM " BEAM$ Mutiplication of the image by a gaussian
    beam

2 PARAMETERS2$
        TASK\REAL "BEAM Parameters " PARAMETERS2$[7] parameters are the same
    as for function GAUSS

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