diff --git a/index.c b/index.c
index 47a62f8..4d7f971 100644
--- a/index.c
+++ b/index.c
@@ -58,6 +58,26 @@ const uint64_t *mm_idx_get(const mm_idx_t *mi, uint64_t minier, int *n)
 	}
 }
 
+void mm_idx_stat(const mm_idx_t *mi)
+{
+	int i, n = 0;
+	uint64_t sum = 0, len = 0;
+	for (i = 0; i < mi->n_seq; ++i)
+		len += mi->seq[i].len;
+	for (i = 0; i < 1<<mi->b; ++i)
+		if (mi->B[i].h) n += kh_size((idxhash_t*)mi->B[i].h);
+	for (i = 0; i < 1<<mi->b; ++i) {
+		idxhash_t *h = (idxhash_t*)mi->B[i].h;
+		khint_t k;
+		if (h == 0) continue;
+		for (k = 0; k < kh_end(h); ++k)
+			if (kh_exist(h, k))
+				sum += kh_key(h, k)&1? 1 : (uint32_t)kh_val(h, k);
+	}
+	fprintf(stderr, "[M::%s::%.3f*%.2f] distinct minimizers: %d; average occurrences: %.3lf; average spacing: %.3lf\n",
+			__func__, realtime() - mm_realtime0, cputime() / (realtime() - mm_realtime0), n, (double)sum / n, (double)len / sum);
+}
+
 uint32_t mm_idx_cal_max_occ(const mm_idx_t *mi, float f)
 {
 	int i;
diff --git a/main.c b/main.c
index 66dc1e8..4073c75 100644
--- a/main.c
+++ b/main.c
@@ -34,7 +34,7 @@ int main(int argc, char *argv[])
 	mm_realtime0 = realtime();
 	mm_mapopt_init(&opt);
 
-	while ((c = getopt(argc, argv, "w:k:B:b:t:r:c:f:Vv:NOg:I:d:lRPST:L:Dx:H")) >= 0) {
+	while ((c = getopt(argc, argv, "w:k:B:b:t:r:c:f:Vv:NOg:I:d:lST:L:Dx:H")) >= 0) {
 		if (c == 'w') w = atoi(optarg);
 		else if (c == 'k') k = atoi(optarg);
 		else if (c == 'b') b = atoi(optarg);
@@ -48,8 +48,6 @@ int main(int argc, char *argv[])
 		else if (c == 'v') mm_verbose = atoi(optarg);
 		else if (c == 'g') opt.max_gap = atoi(optarg);
 		else if (c == 'N') keep_name = 0;
-		else if (c == 'R') opt.flag |= MM_F_WITH_REP;
-		else if (c == 'P') opt.flag &= ~MM_F_WITH_REP;
 		else if (c == 'D') opt.flag |= MM_F_NO_SELF;
 		else if (c == 'O') opt.flag |= MM_F_NO_ISO;
 		else if (c == 'S') opt.flag |= MM_F_AVA | MM_F_NO_SELF;
@@ -98,8 +96,6 @@ int main(int argc, char *argv[])
 //		fprintf(stderr, "    -D         skip self mappings but keep dual mappings\n"); // too confusing to expose to end users
 		fprintf(stderr, "    -S         skip self and dual mappings\n");
 		fprintf(stderr, "    -O         drop isolated hits before chaining (EXPERIMENTAL)\n");
-		fprintf(stderr, "    -P         filtering potential repeats after mapping (EXPERIMENTAL)\n");
-//		fprintf(stderr, "    -R         skip post-mapping repeat filtering\n"); // deprecated option for backward compatibility
 		fprintf(stderr, "    -x STR     preset (recommended to be applied before other options) []\n");
 		fprintf(stderr, "               ava10k: -Sw5 -L100 -m0 (PacBio/ONT all-vs-all read mapping)\n");
 		fprintf(stderr, "  Input/Output:\n");
@@ -130,6 +126,7 @@ int main(int argc, char *argv[])
 				fprintf(stderr, "[M::%s::%.3f*%.2f] dumpped the (partial) index to disk\n", __func__, realtime() - mm_realtime0, cputime() / (realtime() - mm_realtime0));
 		}
 		if (argc != optind + 1) mm_mapopt_update(&opt, mi);
+		if (mm_verbose >= 3) mm_idx_stat(mi);
 		for (i = optind + 1; i < argc; ++i)
 			mm_map_file(mi, argv[i], &opt, n_threads, mini_batch_size);
 		mm_idx_destroy(mi);
diff --git a/map.c b/map.c
index 2ab91a6..47e0a4d 100644
--- a/map.c
+++ b/map.c
@@ -18,7 +18,6 @@ void mm_mapopt_init(mm_mapopt_t *opt)
 	opt->max_gap = 10000;
 	opt->min_cnt = 4;
 	opt->min_match = 40;
-	opt->flag = MM_F_WITH_REP;
 }
 
 void mm_mapopt_update(mm_mapopt_t *opt, const mm_idx_t *mi)
diff --git a/minimap.h b/minimap.h
index 37139d7..b32e71e 100644
--- a/minimap.h
+++ b/minimap.h
@@ -8,7 +8,6 @@
 #define MM_IDX_DEF_B    14
 #define MM_DEREP_Q50    5.0
 
-#define MM_F_WITH_REP  0x1
 #define MM_F_NO_SELF   0x2
 #define MM_F_NO_ISO    0x4
 #define MM_F_AVA       0x8
@@ -87,6 +86,7 @@ mm_idx_t *mm_idx_init(int w, int k, int b, int is_hpc);
 void mm_idx_destroy(mm_idx_t *mi);
 mm_idx_t *mm_idx_gen(struct bseq_file_s *fp, int w, int k, int b, int is_hpc, int mini_batch_size, int n_threads, uint64_t batch_size, int keep_name);
 uint32_t mm_idx_cal_max_occ(const mm_idx_t *mi, float f);
+void mm_idx_stat(const mm_idx_t *idx);
 const uint64_t *mm_idx_get(const mm_idx_t *mi, uint64_t minier, int *n);
 
 mm_idx_t *mm_idx_build(const char *fn, int w, int k, int is_hpc, int n_threads);