This is cutadapt 2.8 with Python 3.7.4 Command line parameters: -a C{9} -m 20 -o TP6.trim.fastq TP6.fastq Processing reads on 1 core in single-end mode ... Finished in 2.08 s (16 us/read; 3.81 M reads/minute). === Summary === Total reads processed: 132,135 Reads with adapters: 23,641 (17.9%) Reads that were too short: 2,289 (1.7%) Reads written (passing filters): 129,846 (98.3%) Total basepairs processed: 8,060,235 bp Total written (filtered): 7,563,433 bp (93.8%) === Adapter 1 === Sequence: CCCCCCCCC; Type: regular 3'; Length: 9; Trimmed: 23641 times; Reverse-complemented: 0 times No. of allowed errors: 0-9 bp: 0 Bases preceding removed adapters: A: 48.9% C: 0.0% G: 15.8% T: 35.2% none/other: 0.1% Overview of removed sequences length count expect max.err error counts 3 2439 2064.6 0 2439 4 1429 516.2 0 1429 5 1038 129.0 0 1038 6 836 32.3 0 836 7 743 8.1 0 743 8 674 2.0 0 674 9 561 0.5 0 561 10 528 0.5 0 528 11 550 0.5 0 550 12 559 0.5 0 559 13 562 0.5 0 562 14 515 0.5 0 515 15 545 0.5 0 545 16 522 0.5 0 522 17 547 0.5 0 547 18 508 0.5 0 508 19 464 0.5 0 464 20 460 0.5 0 460 21 493 0.5 0 493 22 516 0.5 0 516 23 457 0.5 0 457 24 473 0.5 0 473 25 459 0.5 0 459 26 448 0.5 0 448 27 418 0.5 0 418 28 453 0.5 0 453 29 444 0.5 0 444 30 397 0.5 0 397 31 361 0.5 0 361 32 360 0.5 0 360 33 401 0.5 0 401 34 374 0.5 0 374 35 309 0.5 0 309 36 292 0.5 0 292 37 253 0.5 0 253 38 283 0.5 0 283 39 233 0.5 0 233 40 252 0.5 0 252 41 196 0.5 0 196 42 215 0.5 0 215 43 228 0.5 0 228 44 207 0.5 0 207 45 224 0.5 0 224 46 198 0.5 0 198 47 193 0.5 0 193 48 177 0.5 0 177 49 187 0.5 0 187 50 144 0.5 0 144 51 104 0.5 0 104 52 80 0.5 0 80 53 52 0.5 0 52 54 86 0.5 0 86 55 60 0.5 0 60 56 35 0.5 0 35 57 20 0.5 0 20 58 14 0.5 0 14 59 16 0.5 0 16 60 21 0.5 0 21 61 28 0.5 0 28