Hello, why is there a difference between the sizes of two flops. This is from the original LEF file.

MACRO sky130_fd_sc_hd__dfxtp_4
  CLASS CORE ;
  FOREIGN sky130_fd_sc_hd__dfxtp_4 ;
  ORIGIN  0.000000  0.000000 ;
  SIZE  8.740000 BY  2.720000 ;
  SYMMETRY X Y R90 ;
  SITE unithd ;

And this is from the generated

merged.lef

MACRO sky130_fd_sc_hd__dfxtp_4
  CLASS CORE ;
  FOREIGN sky130_fd_sc_hd__dfxtp_4 ;
  ORIGIN  0.000000  0.000000 ;
  SIZE 12.42 BY 2.72 ;
  SYMMETRY X Y R90 ;
  SITE unithd ;

That's because we do the padding in the lef file, so merged.lef is a padded lef while merged_unpadded.lef is the original lef. This will change in rc5 and we will rely on the tools to do the padding internally.

Ah, now it makes all sense. Thanks, as always you have been on point