SPD can also display time bin profiles and time bin images for correlator/spectrometer configurations which provide time or pulsar binning. In the case of pulsar binning, the de-dispersed pulsar bin profile can be displayed.
For the correlation function, the default action is to display only that part of the function which is actually measured in the correlator. For autocorrelations, this will generally be only be the positive lags. If negative lags are requested for autocorrelations with the 'lags' command, the positive lag measurements are mirrored into the negative lags for display.
SPD> mode v - selection by variable or product number. SPD> mode b - selection by baseline and/or polarisation. SPD> mode - show current mode setting.
SPD> select 2 5 7 - displays spectra of products 2, 5 & 7 on seperate plot panels. SPD> select 4>12 - displays spectra of products 4 to 12 on seperate plot panels. SPD> select l1 a1 - displays lag and frequency spectra of product 1 on separate plot panels. SPD> select a1&2 - displays frequency spectrum of products 1 & 2 on one plot panel. SPD> select a1&2 a3&4 - displays frequency spectra in two panels, each containing two products. SPD> select a2-1 - displays the difference frequency spectrum between two products. SPD> select 1-2 4+5 - displays difference and sum frequency spectra in two panels.Special Parkes Multibeam Selection:
SPD> select mbN - displays lag or frequency spectra of N beams, two polarisations per plot panel, in the special Parkes multibeam layout.2. Selection by frequency band/baseline/polarisation ( mode b ):
SPD> select 1aa - displays all baselines with antenna 1, polarisation AA, frequency 1. SPD> select 12ba - displays baseline 1*2, polarisation BA, frequency 1. SPD> select 14cc - displays baseline 1*4, polarisation AA, frequency 2. SPD> select cd - displays all baselines, polarisation AB, frequency 2. SPD> select 24 - displays baseline 2*4, all polarisations. SPD> select * - displays all active productsFrequency only selection, displaying all previously selected baselines/polarisations for the selected frequencies:
SPD> select f2 - display frequency 2 only. SPD> select f1 f3 - display frequencies 1 and 3 only. SPD> select f1-4 - display frequencies 1 to 4 only. SPD> select f* - display all frequencies. SPD> select z1 - display CABB zoom band 1 only. SPD> select z1 z3 - display CABB zoom bands 1 and 3 only. SPD> select z1-2 - display CABB zoom bands 1 to 2 only. SPD> select z* - display all CABB zoom bands.Note: The polarisation types must be enabled with the ON/OFF command (see below). Initially only AA, BB, CC and DD are enabled. The use of C and D to denote the A & B polarisations of the second frequency is allowed only for certain two frequency operating modes. It is not allowed in cases where more than two frequencies may be available, for example with MOPS and CABB. In these cases control of which frequencies are displayed is via the fn parameter of the SELECT or ON/OFF commands.
Then use one of the global display type commands (see below) to select the display type.
SPD> select bp11 - displays the time bin profiles for baseline 1*1, all polarisations. SPD> select pp11 - equivalent to above. SPD> select dp - displays the de-dispersed pulsar bin profiles for all baselines and polarisations.
The bin profile plots the integral over frequency of the amplitude spectrum against bin number. The limits of the integral, by default the entire spectrum, can be defined by the bchannels command. bchannels also defines the frequency range over which the de-dispersion is carried out.
SPD> select bi - displays the time bin image for all polarisations. SPD> select biaa - displays the time bin image for polarisation AA.
The bin image shows colour coded amplitude on the Z-axis as a function of bin number on the X-axis and frequency channel on the Y-axis. If the biq command is set ( see below ), the Z-axis shows a quotient obtained by subtracting and normalising by the band shape, computed from an average of the spectra of all bins included in the plot. X-axis limits are set by the bpbins command. Y-axis limits are set by the bchannels command.
SPD> biq - displays quotient in the bin image plots. SPD> nobiq - displays amplitude in the bin image plots.
SPD> array 1346 - antenna 1,3,4,6 active, antennas 2,5 inactive. SPD> array - show the currently active antennas.
SPD> bins 1-5 10-16 - selects bins 1 to 5 for frequency one, 10 to 16 for frequency 2. SPD> bins 1.3.5 10.11 - selects bins 1,3 & 5 for frequency one, 10 & 11 for frequency 2. SPD> bins - show the currently selected bins.
SPD> on ab ba cd dc - turn on display of all cross polarisation products. SPD> off cc cd dc dd - turn off all second frequency polarisation products. SPD> on f1 f4 - turn on display of frequencies 1 and 4. SPD> on ccs - turn on cross-correlations. SPD> off acs - turn off auto-correlations. SPD> on - display which types are currently displayed.Note: The 'on' or 'off' commands for frequencies are probably more conveniently carried out with the 'select fN' command (see above).
SPD> scale l -0.01 0.01 - scale lag plots to cover the range -0.01 to 0.01 SPD> scale bp 0 200 - scale bin profile plots to cover the range 0 to 200 SPD> scale bi -1 1 - scale bin image plots to cover the range -1 to 1 SPD> scale a - return to auto-scaling for amplitude plots. SPD> scale - autoscale all plots. SPD> scale log - autoscale amplitude plots on a logarithmic scale. SPD> scale log 30 - set the range of log plots to 30dB.
SPD> freq [f1] 1146 2125 - display the frequency range 1146 MHz to 2125 MHz for band 1. SPD> freq f2 1146 2126 - ditto for frequency band 2. SPD> freq - reset to full band for all frequency bands. SPD> freq f3 - reset to full band for frequency band 3. SPD> freq z2 1410 1420 - set frequency range to plot for CABB zoom band 2.
SPD> channels [f1] 100 200 - display channel range 100 to 200 for frequency band 1. SPD> channels f2 200 500 - display channel range 200 to 500 for frequency band 2. SPD> channels 100 200 300 500 - display channel range 100 to 200 for frequency band 1 AND channel range 300 to 500 for frequency band 2. SPD> channels - reset channel selections to defaults.
SPD> lags [f1] -800 100 - display lag channel range -800 to 100 for frequency band 1. SPD> lags f2 -100 500 - display lag channel range -100 to 500 for frequency band 2. SPD> lags -200 200 -100 100 - display lag channel range -200 to 200 for frequency band 1 AND lag channel range -100 to 100 for frequency band 2 SPD> lags - reset lag channel selections to default.
SPD> bpbins 20 30 - displays the bin profile for bins 20 to 30. SPD> ppbins - reset to the full range of available bins.
SPD> layout 3x4 - 3 panels in X by 4 panels in Y. SPD> layout [0x0] - revert to default layout.