This PDF file includes:

• Supplementary Text
  
• fig. S1. Electron diffraction on CeSbTe.
  
• fig. S2. Analysis of neutron powder diffraction data.
  
• fig. S3. Refinement of the pure magnetic Bragg peaks, obtained by subtraction of the 5-K data from the 1.5-K data with respect to the two possible different magnetic structures.
  
• fig. S4. Energy dispersions of CeSbTe along high-symmetry lines.
  
• fig. S5. Additional ARPES measurements on CeSbTe.
  
• fig. S6. Additional magnetic susceptibility and specific heat data.
  
• fig. S7. Accessible magnetic subgroups discussed in this paper.
  
• table S1. Crystallographic data and details of data collection for single-crystal xray and low-temperature neutron diffraction.
  
• table S2. Position coordinates and thermal displacement parameters for paramagnetic (top) and AFM (bottom) CeSbTe.
  
• table S3. Possible dimensions of the irreducible representations at each TRIM and along certain high-symmetry lines of different phases of CeSbTe.

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