Notes. ^a Position of the radio continuum emission reported in the literature, used as the phase center of our observations (Table A.1). ^b D: detected. ND: not detected. −: no observations available. ^c Source status, as defined in Section 2. ^dReference for the maser emission (columns H₂O, OH). The last column (nature) indicates references that spectroscopically confirmed the sources with SP status as PNe. For PN candidates (SC, IC), that column reports the radio continuum detection: 1. Suárez et al. (2009). 2. Zijlstra et al. (1991). 3. Menzies & Wolstencroft (1990). 4. Surendiranath (2002). 5. te Lintel Hekkert et al. (1991). 6. Suárez et al. (2006). 7. Hale et al. (2021). 8. Frew et al. (2013). 9. Sevenster et al. (1997). 10. Irabor et al. (2023). 11. te Lintel Hekkert & Chapman (1996). 12. Pottasch et al. (1986). 13. Kimeswenger (2001) 14. Gesicki et al. (2024). 15. Gómez et al. (2015a). 16. Kohoutek (2001). 17. Walsh et al. (2014). 18. Beuther et al. (2019). 19. Wang et al. (2018). 20. Helfand et al. (1992). 21. Davis et al. (1993). 22. Urquhart et al. (2009). 23. Hsia et al. (2010). 24. White et al. (2005). 25. Forster & Caswell (1989). 26. Urquhart et al. (2011). 27. Cooper et al. (2013). 28. Kanarek et al. (2015). 29. Yung et al. (2013). 30. Van de Steene & Pottasch (1995). 31. Yung et al. (2014). 32. Yoon et al. (2014). 33. Likkel (1989). 34. Whitelock & Menzies (1986). 35. Sabin et al. (2014) 36. Benson et al. (1996). 37. Benson et al. (1990). 38. Zijlstra et al. (1989). 39. Cesaroni et al. (1988). 40. Eder et al. (1988). 41. Zoonematkermani et al. (1990). 42. te Lintel Hekkert et al. (1989).