Newly assigned keys for synthetic photometry:

Johnson–Kron–Cousins system:

• Ug — GAIA DR1–DR3 synthetic Johnson–Kron–Cousins U magnitude 
  Synthetic U magnitude derived from GAIA DR1–DR3 photometry.
• Bg — GAIA DR1–DR3 synthetic Johnson–Kron–Cousins B magnitude 
  Synthetic B magnitude derived from GAIA DR1–DR3 photometry.
• Vg — GAIA DR1–DR3 synthetic Johnson–Kron–Cousins V magnitude 
  Synthetic V magnitude derived from GAIA DR1–DR3 photometry.
• Rg — GAIA DR1–DR3 synthetic Johnson–Kron–Cousins R magnitude 
  Synthetic R magnitude derived from GAIA DR1–DR3 photometry.
• Ig — GAIA DR1–DR3 synthetic Johnson–Kron–Cousins I magnitude 
  Synthetic I magnitude derived from GAIA DR1–DR3 photometry.

SDSS system:

• ug — GAIA DR1–DR3 synthetic SDSS u magnitude 
  Synthetic u magnitude (SDSS system) derived from GAIA DR1–DR3 photometry.
• gg — GAIA DR1–DR3 synthetic SDSS g magnitude
   Synthetic g magnitude (SDSS system) derived from GAIA DR1–DR3 photometry.
• rg — GAIA DR1–DR3 synthetic SDSS r magnitude 
  Synthetic r magnitude (SDSS system) derived from GAIA DR1–DR3 photometry.
• ig — GAIA DR1–DR3 synthetic SDSS i magnitude 
  Synthetic i magnitude (SDSS system) derived from GAIA DR1–DR3 photometry.
• zg — GAIA DR1–DR3 synthetic SDSS z magnitude 
  ynthetic z magnitude (SDSS system) derived from GAIA DR1–DR3 photometry.
• yg — GAIA DR1–DR3 synthetic Pan-STARRS1 y magnitude 
  Synthetic y magnitude (Pan-STARRS1 system) derived from GAIA DR1–DR3 photometry

These additions complement the currently available GAIA keys:

• BG — GAIA DR1–DR3 GBP mean magnitude
  Mean magnitude in the Gaia Blue Photometer (GBP) passband.
• GG — GAIA DR1–DR3 G mean magnitude
  Mean magnitude in the Gaia broad G passband.
• RG — GAIA DR1–DR3 GRP mean magnitude 
  Mean magnitude in the Gaia Red Photometer (GRP) passband.