class Continuum and Line Analysis Single-dish Software - IRAM

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16 CHAPTER 3. USER MANUEL 3.1.7 Variables The Rope to Hang Yourself class makes use of sic variables to allow more flexibility in the processing, in particular in procedures. sic variables are extremely powerful, with the side effect that if you want, you can corrupt your data by overwriting some information. class attempts to prevent the most disastrous errors by defining some of the most critical variables as READONLY. They cannot be overwritten by the user, but their values can be used in expressions, either arithmetic or logical. However, an unprotected mode is available for specific processing using the command SET VARIABLE. Index Variables The variable FOUND refers to the number of observations in the index. It is declared Read-Only of course. Its main use is either to write a sic loop that goes through the index or to test for actions which should be performed only if something exists in the index. The FIND command does not return an error, but set FOUND = 0, if it finds nothing. A second variable related to the index is the INDEX array, of dimension FOUND, which contains the observation numbers of all observations in the index. Header Variables The most important header parameters are defined by default as sic variables in a protected mode. The others, of less frequent use, can be accessed if required by the user (see “Advanced Processing”). The default variables are (RW means Read-Write variable, RO, Read-Only). TELESCOPE Character*12, RW, Telescope name NUMBER Integer, RW, Observation number VERSION Integer, RO, Version number DATATYPE Integer, RO, Type of observation 0 Line, 1 Continuum, 2 Skydip QUALITY Integer, RO, Quality of data SCAN Integer, RO, Original scan number UTOBS Double, RO, UT of observation (Radians) LSTOBS Double, RO, LST of observation (Radians) AZIMUTH Real, RW, Azimuth of observation (Radians) ELEVATION Real, RW, Elevation of observation (Radians) TSYS Real, RW, System temperature TIME Real, RW, Integration time (Seconds) SOURCE Character*12, RW, Source name LAMBDA Double, RW, Longitude of source (Radians) BETA Double, RW, Latitude of source (Radians) OFF_LAMBDA Double, RW, Offset in longitude (Radians) OFF_BETA Double, RW, Offset in latitude (Radians) EPOCH Real, RW, Epoch of coordinates (Years) LINE Character*12 RW, Line name CHANNELS Integer, RO, Number of channels REFERENCE Real, RW, Reference channel
3.2. SPECTRA LINE PROCESSING 17 FREQ_STEP Real, RW, Frequency step by channel (MHz) VELO_STEP Real, RW, Velocity step by channel (km/s) VELOCITY Real, RW, Velocity of reference channel FREQUENCY Double, RW, Rest frequency at reference channel IMAGE Double, RW, Image frequency " " " " BEAM_EFF Real, RW, Telescope beam efficiency FORWARD_EFF Real, RW, Telescope forward efficiency GAIN_IMAGE Real, RW, Image to signal band ratio WATER Real, RO, Water vapor content (mm) PRESSURE Real, RO, External pressure (hPa) AMBIENT_T Real, RO, External temperature (K) CHOPPER_T Real, RO, Chopper temperature (K) COLD_T Real, RO, Cold load temperature (K) TAU_SIGNAL Real, RO, Opacity in signal band TAU_IMAGE Real, RO, Opacity in image band ATM_SIGNAL Real, RO, Atmospheric temperature in signal band ATM_IMAGE Real, RO, Atmospheric temperature in image band RX Real[8192] RO, X values of data points RY Real[8192] RW, Y values of data points 8192 is currently the maximum size of the spectra, but the variables RX and RY are redimensioned to the effective number of channels for each spectrum. Advanced Processing All header parameters can be defined as sic variables for specific processing of the data, either as Read-Only or as Read-Write, using the command SET VARIABLE. Read-Write mode is to be used with caution, since even critical variables (e.g. the number of channels) can be modified. Refer to command SET VARIABLE for more details. By using the appropriate variables and the sic mathematical and logical facilities, customized data processing becomes possible, as well as complete data editing. 3.2 Spectra Line Processing 3.2.1 Plotting Spectra Plotting spectra is controlled by several parameters: • SET UNIT Type defines the unit of the X axis, which may be C (for Channel number), V (for Velocity), F (for Frequency) or I (for Image). • SET PLOT Type defines the plotting type PLOT (Normal or Histogram); Normal gives straight lines connecting the data points (this is the default since it is faster). Histogram gives a more realistic representation of spectroscopic data.
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