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[Gian-Marco Rignanese <rignanese@pcpm.ucl.ac.be>]

Dear Steven,

I apologize for my partly incorrect answer... Following Razvan  
suggestion (who is THE expert since he coded the symmetries), I  
checked that with "spgaxor 4" (as you had done in the beginning)  
everything works fine.

Dear Katalin,

for your information, the number of equivalent positions for the  
various atoms is different. From the table, we can see that Pb, Bi,  
and Cl occupy 4c sites (4 equivalent positions) while O is on a 8e  
Wyckoff site (8 equivalent positions). Hence, despite the number of  
independent atoms is 4, the unit cell contains 4+4+4+8=20 atoms  
(which is indeed a multiple of 5).

Best regards,

Gian-Marco.