diff --git a/README.md b/README.md
index a478964..b9684bc 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
-# backmap.pl v0.4
+# backmap.pl v0.5
 
 ## Description
 __Automatic read mapping and genome size estimation from coverage.__
 
-Automatic mapping of paired, unpaired, PacBio and Nanopore reads to an assembly with `bwa mem` or `minimap2`, execution of `qualimap bamqc` and estimation of genome size from mapped nucleotides divided by mode of the coverage distribution (>0). This method was first pulished in Schell et al. (2017) and is slightly refined in this script.  
+Automatic mapping of paired, unpaired, PacBio and Nanopore reads to an assembly with `bwa mem` or `minimap2`, execution of `qualimap bamqc` and estimation of genome size from mapped nucleotides divided by mode of the coverage distribution (>0). This method was first pulished in Schell et al. (2017). To show high accuracy and reliability of this method throughout the tree of life, Pfenninger et al. (2021) published a study comparing different estimators. Currently, the estimator N<sub>bm</sub>/m (number of back-mapped bases divided by the modal value of the sequencing depth distribution) is implemented in this script only.  
 The tools `samtools`, `bwa` and/or `minimap2` need to be in your `$PATH`. The tools `qualimap`, `multiqc`, `bedtools` and `Rscript` are optional but needed to create the mapping quality report, coverage histogram as well as genome size estimation and to plot of the coverage distribution respectively.
 
 ## Dependencies
@@ -46,8 +46,9 @@ Mandatory:
 			Skips read mapping
 			Overrides -nh
 			Technologies will recognized correctly if filenames end with
-			.pb(.sort).bam or .ont(.sort).bam for PacBio and Nanopore respectively.
-			Otherwise they are assumed to be from Illumina.
+			.pb(.sort).bam, .hifi(.sort).bam or .ont(.sort).bam for PacBio CLR,
+			PacBio HiFi and Nanopore respectively. Otherwise they are assumed to
+			be from Illumina.
 			
 	All mandatory options except of -a can be specified multiple times
 
@@ -55,7 +56,7 @@ Options: [default]
 	-o STR		Output directory [.]
 			Will be created if not existing
 	-t INT		Number of parallel executed processes [1]
-			Affects bwa mem, samtools sort, qualimap bamqc
+			Affects bwa mem, samtools sort/index/view/stats, qualimap bamqc
 	-pre STR	Prefix of output files if -a is used [filename of -a]
 	-sort		Sort the bam file(s) (-b) [off]
 	-nq		Do not run qualimap bamqc [off]
@@ -76,6 +77,8 @@ Options: [default]
 ```
 
 ## Citation
+Pfenninger M, Schönenbeck P & Schell T (2021). ModEst: Accurate estimation of genome size from next generation sequencing data. _Molecular ecology resources_, 00, 1–11. <https://doi.org/10.1111/1755-0998.13570>  
+
 Schell T, Feldmeyer B, Schmidt H, Greshake B, Tills O et al. (2017). An Annotated Draft Genome for _Radix auricularia_ (Gastropoda, Mollusca). _Genome Biology and Evolution_, 9(3):585–592, <https://doi.org/10.1093/gbe/evx032>
 
 __If you use this tool please cite the dependencies as well:__
diff --git a/backmap.pl b/backmap.pl
index bb237f6..8bdd050 100755
--- a/backmap.pl
+++ b/backmap.pl
@@ -7,7 +7,7 @@
 use Number::FormatEng qw(:all);
 use Parallel::Loops;
 
-my $version = "0.4";
+my $version = "0.5";
 
 sub print_help{
 	print STDOUT "\n";
@@ -32,14 +32,15 @@ sub print_help{
 	print STDOUT "\t-b STR\t\tBam file to calculate coverage from\n";
 	print STDOUT "\t\t\tSkips read mapping\n";
 	print STDOUT "\t\t\tOverrides -nh\n";
-	print STDOUT "\t\t\tTechnologies will recognized correctly if filenames end with\n\t\t\t.pb(.sort).bam or .ont(.sort).bam for PacBio and Nanopore respectively.\n\t\t\tOtherwise they are assumed to be from Illumina.\n";
+	print STDOUT "\t\t\tTechnologies will recognized correctly if filenames end with\n\t\t\t.pb(.sort).bam, .hifi(.sort).bam or .ont(.sort).bam for PacBio CLR,\n\t\t\tPacBio HiFi and Nanopore respectively. Otherwise they are assumed to\n\t\t\tbe from Illumina.\n";
+	print STDOUT "\n";
 	print STDOUT "\tAll mandatory options except of -a can be specified multiple times\n";
 	print STDOUT "\n";
 	print STDOUT "Options: [default]\n";
 	print STDOUT "\t-o STR\t\tOutput directory [.]\n";
 	print STDOUT "\t\t\tWill be created if not existing\n";
 	print STDOUT "\t-t INT\t\tNumber of parallel executed processes [1]\n";
-	print STDOUT "\t\t\tAffects bwa mem, samtools sort, qualimap bamqc\n";
+	print STDOUT "\t\t\tAffects bwa mem, samtools sort/index/view/stats, qualimap bamqc\n";
 	print STDOUT "\t-pre STR\tPrefix of output files if -a is used [filename of -a]\n";
 	print STDOUT "\t-sort\t\tSort the bam file(s) (-b) [off]\n";
 	print STDOUT "\t-nq\t\tDo not run qualimap bamqc [off]\n";
@@ -210,7 +211,7 @@ sub round_format_pref{
 			$input_error = 1;
 		}
 	}
-	if(scalar(@pb) > 0 or scalar(@ont) > 0){
+	if(scalar(@pb) > 0 or scalar(@hifi) > 0 or scalar(@ont) > 0){
 		if(not defined(can_run("minimap2"))){
 			print STDERR "ERROR\tminimap2 is not in your \$PATH\n";
 			$input_error = 1;
@@ -738,6 +739,11 @@ sub round_format_pref{
 	}
 }
 
+foreach(@sorted_bams){
+	$cmd = "samtools index -@ $samtools_threads $_";
+	exe_cmd($cmd,$verbose,$dry);
+}
+
 if($run_bamqc_switch == 1){
 	if(defined(can_run("qualimap"))){
 		foreach(@sorted_bams){
@@ -766,6 +772,13 @@ sub round_format_pref{
 
 if($create_histo_switch == 1){
 	
+	foreach(@sorted_bams){
+		my $filename = (split(/\//,$_))[-1];
+		my $cov_hist_file = "$out_dir/$filename.cov-hist";
+		$cmd = "samtools view -@ $samtools_threads -b -h -F 256 $_ | bedtools genomecov -ibam stdin -d | awk \'{print \$3}\' | sort -g | uniq -c | awk '{print \$2\"\\t\"\$1}' > $cov_hist_file";
+		exe_cmd($cmd,$verbose,$dry);
+	}
+	
 	my $multiple_histos = Parallel::Loops->new($maxProcs);
 	$multiple_histos->share(\%cov_files);
 	$multiple_histos->share(\%peak_cov);
@@ -787,8 +800,6 @@ sub round_format_pref{
 		
 		my $filename = (split(/\//,$_))[-1];
 		my $cov_hist_file = "$out_dir/$filename.cov-hist";
-		$cmd = "samtools view -b -h -F 256 $_ | bedtools genomecov -ibam stdin -d | awk \'{print \$3}\' | sort -g | uniq -c | awk '{print \$2\"\\t\"\$1}' > $cov_hist_file";
-		exe_cmd($cmd,$verbose,$dry);
 		
 		$cov_files{$tech} = $cov_hist_file;
 		
@@ -899,7 +910,12 @@ sub round_format_pref{
 if($estimate_genome_size_switch == 1){
 	
 	my %results;
-		
+	
+	foreach(@sorted_bams){
+		$cmd = "samtools stats -@ $samtools_threads $_ > $_.stats 2> $_.stats.err";
+		exe_cmd($cmd,$verbose,$dry);
+	}
+
         my $multiple_genome_size = Parallel::Loops->new($maxProcs);
         $multiple_genome_size->share(\%results);
 	
@@ -908,8 +924,8 @@ sub round_format_pref{
 			print STDERR "CMD\tsort -rgk2 $_.cov-hist | awk \'\$1!=0{print \$1}\' | head -1\n";
 		}
 		
-		$cmd = "samtools stats $_ > $_.stats 2> $_.stats.err";
-		exe_cmd($cmd,$verbose,$dry);
+#		$cmd = "samtools stats $_ > $_.stats 2> $_.stats.err";
+#		exe_cmd($cmd,$verbose,$dry);
 		
 		if($dry == 0){