Summary of Residual On-axis Leakage

Scope: manifest indices 14–49, excluding 24–29 (ODC-5241 era; ODC-3611 legacy fields not included).
Each table row is one (ODC weight, calibration variant, reference field) combination, aggregated over all SB_REF observations of that field.
Bandpass calibrated (bpcal) and Bandpass + Leakage on-axis calibrated (lcal) variants are shown in separate tables.
Plot badges on the Reference field column link to per-ODC and all-ODC footprint heatmaps (see legend below). SB_REF media (Stokes/pol.degree MP4, combined-beams PNG, beamwise stats, PAF overlay and movie) are accessible via the drop-down trigger on each SB_REF ID in the Observed SB_REF IDs column.

Column legend

Notation convention: the superscript in parentheses denotes the index (dimension) over which the statistic is computed. For example, \(\mu^{(s)}\) = median over SB_REF observations \(s\); \(\mu^{(b)}\) = median over beams \(b\). Subscripts denote the free indices the result depends on.

ColumnMeaning
ODC weightODC WEIGHTS ID
VariantBandpass calibrated (bpcal) or Bandpass + Leakage on-axis calibrated (lcal)
Reference fieldName (with skyPos) of the field used for calibration
n_obs(f)Number of independent observations for this field (per ODC weight)
Observed SB_REF IDsLinks to the leakage statistics card for each individual SB_REF observation
μ⁽ᵇ⁾Median across beams of \(\mu_{b,f}^{(s)}\)
MAD⁽ᵇ⁾MAD across beams of \(\mu_{b,f}^{(s)}\) — beam-to-beam spread
min⁽ᵇ⁾Minimum across beams of \(\mu_{b,f}^{(s)}\)
max⁽ᵇ⁾Maximum across beams of \(\mu_{b,f}^{(s)}\)

All statistics are over percentage linear polarisation leakage, \(dL\) (%). \(dL = 100 \times L/I\), where \(L\) is the linear polarisation intensity and \(I\) is the Stokes I total intensity.

Plot badges on Reference field column:
dL / |dQ|,|dU| (blue) — per-ODC footprint for that row's variant;
dL≈ / |dQ|,|dU|≈ — all-ODC comparison footprint (bpcal + lcal stacked).
dL = residual leakage (dL = √(Q²+U²)/I (%)), faceted by ODC weight and calibration variant.
|dQ|,|dU| = split-circle plots of |Q|/I (top-left) and |U|/I (bottom-right).

Bandpass calibrated

ODC weightVariantReference fieldn_obs(f)Observed SB_REF IDsμ⁽ᵇ⁾MAD⁽ᵇ⁾min⁽ᵇ⁾max⁽ᵇ⁾
5229bpcalREF_0236-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿2
0.6240.1530.1891.64
5229bpcalREF_0324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿3
0.7370.3270.2521.885
5231bpcalREF_0236-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.570.1590.2111.837
5231bpcalREF_0324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.7460.260.2331.87
5231bpcalREF_0524-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.4720.1730.2492.141
5231bpcalREF_1212-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.560.2280.2275.468
5231bpcalREF_1324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.6110.120.2511.32
5241bpcalREF_0236-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿4
0.5980.1960.2411.788
5241bpcalREF_0324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿4
0.7640.3250.2631.982
5241bpcalREF_1212-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿4
0.5460.2310.215.274
5241bpcalREF_1324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿5
0.570.0980.2691.43
5241bpcalREF_1612-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿2
0.8480.2330.2712.735
5241bpcalREF_2300-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.5820.1550.2462.017
5259bpcalREF_0236-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.6370.1810.2241.798
5259bpcalREF_0324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.6640.2660.2342.052
5259bpcalREF_1124-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿2
0.5890.2530.2192.268
5259bpcalREF_1324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿2
0.5920.1640.2091.936

Bandpass + Leakage (on-axis) calibrated

ODC weightVariantReference fieldn_obs(f)Observed SB_REF IDsμ⁽ᵇ⁾MAD⁽ᵇ⁾min⁽ᵇ⁾max⁽ᵇ⁾
5229lcalREF_0236-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿2
0.3730.2040.0951.528
5229lcalREF_0324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿3
0.3980.2660.0831.875
5231lcalREF_0236-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.3640.1680.0931.71
5231lcalREF_0324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.5260.3060.1131.858
5231lcalREF_0524-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.3030.1710.1062.088
5231lcalREF_1212-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.3130.1690.1045.48
5231lcalREF_1324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.340.1710.0931.291
5241lcalREF_0236-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿4
0.3450.1730.0931.655
5241lcalREF_0324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿4
0.5220.3440.0981.965
5241lcalREF_1212-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿4
0.2820.1490.0995.291
5241lcalREF_1324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿5
0.3440.1560.1141.434
5241lcalREF_1612-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿2
0.5970.2660.1052.63
5241lcalREF_2300-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.3130.1330.0911.604
5259lcalREF_0236-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.4790.2530.0861.677
5259lcalREF_0324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿1
0.4020.2490.1062.039
5259lcalREF_1124-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿2
0.3930.240.0942.161
5259lcalREF_1324-28 dL |dQ|,|dU| dL≈ |dQ|,|dU|≈ dQ∿ dU∿2
0.3630.1760.0881.88

3D Leakage cube (NetCDF4)

The leakage data is stored as a labelled 3-D NetCDF4 cube with dimensions beam (36) × field (N) × odc (M).
Variables: dL_bpcal, dL_lcal, p90_bpcal, p90_lcal, nsb_bpcal, nsb_lcal.
Open with xarray.open_dataset('leakage_cube.nc') for programmatic slicing, outlier detection, or further analysis.

leakage_cube.nc (109 KB)

Gain Calibration Strategy

Open: Gain Calibration Strategy — derivation of the bandpass correction factors from 1934−638 measurements.

dQ/dU Correction Factors

Per-beam leakage correction factors derived from 1934−638 observations. All three files open as plain text in a new browser tab.