An independent check of the CLK_PERF0..3 rows (CMT_TOP_{L,R}_LOWER_B) and
the PHSR_PERFCLK0..3 rows (HCLK_CMT{,_L}) of prjxray-db against cavearr's
PERFCLK campaigns. It is awk and jq over bitread output and the prjxray-db
tilegrid. It does not use the campaigns' scripts/, their segdata_*.txt, or
bit2fasm/fasm2frames.
Every tile of the kind in every specimen is a sample, used or not.