Thanks for your inputs. The TerraSAR-X WS MGD directory is named TDX1_SAR__MGD_RE___SC_S_SRA_20191109T065739_20191109T065801. Looking in the metadata (SNAP screenshot attached) it seems that the beam incidence angles for this image are in the range 41.6 - 48.5 degrees. This is at the far extreme of the “Full Performance Range” for the Wide ScanSAR mode (15.6 - 49 degrees according to the TSX Product Guide).
