Fix the bug of spectral profiles for computed stokes (#1123)

* fix the bug of spectral profiles for computed stokes

* modify the change log

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Stopped calculating per-cube histogram unnecessarily when switching to a new Stokes value ([#1013](https://github.com/CARTAvis/carta-backend/issues/1013)).
 * Ensured that HTTP server returns error codes correctly ([#1011](https://github.com/CARTAvis/carta-backend/issues/1011)).
 * Fixed crash problems for compressed FITS files ([#999](https://github.com/CARTAvis/carta-backend/issues/999) and [#1014](https://github.com/CARTAvis/carta-backend/issues/1014)).
+* Fixed incorrect spectral profiles for computed stokes ([#1122](https://github.com/CARTAvis/carta-backend/issues/1122)).
 
 ## [3.0.0-beta.3]
 

src/Frame/Frame.cc

@@ -2211,8 +2211,9 @@ casacore::Slicer Frame::GetExportRegionSlicer(const CARTA::SaveFile& save_file_m
 bool Frame::GetStokesTypeIndex(const string& coordinate, int& stokes_index) {
  // Coordinate could be profile (x, y, z), stokes string (I, Q, U), or combination (Ix, Qy)
  bool is_stokes_string = StokesStringTypes.find(coordinate) != StokesStringTypes.end();
+ bool is_combination = (coordinate.size() > 1 && (coordinate.back() == 'x' || coordinate.back() == 'y' || coordinate.back() == 'z'));
 
- if (coordinate.size() == 2 || coordinate.size() == 3 || is_stokes_string) {
+ if (is_combination || is_stokes_string) {
  bool stokes_ok(false);
 
  std::string stokes_string;