diff --git a/src/measure.c b/src/measure.c
index 6b5d0a1..49b86f9 100644
--- a/src/measure.c
+++ b/src/measure.c
@@ -165,9 +165,20 @@ void measure_param_print(struct measure_params* mp) {
 }
 
 void measure_summary(struct measure_params* mp, struct measure_state* ms) {
-  char uuidstr[128];
+  char uuidstr[37] = {0};
   uuid_unparse (ms->uuid, uuidstr);
-  fprintf(stdout, "tag,uuid,metric,value\n");
+
+  char bin[41] = {0}, txt[41] = {0};
+  FILE *fbin, *ftxt;
+  size_t res;
+
+  sprintf(bin, "%s.bin", uuidstr);
+  if ((fbin = fopen(bin, "a+")) == NULL) goto measurement_io_error;
+  if (fwrite(ms->uuid, sizeof(uuid_t), 1, fbin) != 1) goto measurement_io_error;
+  if (fwrite(&mp->max_measure, sizeof(uint64_t), 1, fbin) != 1) goto measurement_io_error;
+  if (fwrite(&ms->log, sizeof(uint64_t), mp->max_measure, fbin) != mp->max_measure) goto measurement_io_error;
+  if (fclose(fbin) != 0) goto measurement_io_error;
+  printf("saved raw data as %s\n", bin);
 
   uint64_t* real_log = ms->log;
   uint64_t real_log_size = mp->max_measure;
@@ -184,7 +195,6 @@ void measure_summary(struct measure_params* mp, struct measure_state* ms) {
     real_log_size--;
   }
   printf("[summary] cutted %lu values in total\n", mp->max_measure - real_log_size);
-  fprintf(stdout, "%s,%s,count,%lu\n", mp->tag, uuidstr, real_log_size);
   if (real_log_size == 0) return;
 
   // AVERAGE
@@ -192,25 +202,33 @@ void measure_summary(struct measure_params* mp, struct measure_state* ms) {
   for (int i = 0; i < real_log_size; i++) {
     avg += ((double) real_log[i]) / ((double) real_log_size);
   }
-  fprintf(stdout, "%s,%s,avg,%f\n",  mp->tag, uuidstr, avg);
 
   // DISTRIBUTION
   qsort (real_log, real_log_size, sizeof(uint64_t), cmpuint64t);
   uint64_t min = real_log[0];
-  fprintf(stdout, "%s,%s,min,%lu\n", mp->tag, uuidstr, min);
-
   uint64_t max = real_log[real_log_size-1];
-  fprintf(stdout, "%s,%s,max,%lu\n", mp->tag, uuidstr, max);
+  uint64_t med = real_log[(int)(0.50 * real_log_size) - 1];
+  uint64_t q25 = real_log[(int)(0.25 * real_log_size) - 1];
+  uint64_t q75 = real_log[(int)(0.75 * real_log_size) - 1];
+  uint64_t q99 = real_log[(int)(0.99 * real_log_size) - 1];
 
-  uint64_t med = real_log[(int)(0.50 * real_log_size)];
-  fprintf(stdout, "%s,%s,med,%lu\n", mp->tag, uuidstr, med);
 
-  uint64_t q25 = real_log[(int)(0.25 * real_log_size)];
-  fprintf(stdout, "%s,%s,q25,%lu\n", mp->tag, uuidstr, q25);
+  sprintf(txt, "%s.txt", uuidstr);
+  if ((ftxt = fopen(txt, "a+")) == NULL) goto measurement_io_error;
+  if (fprintf(ftxt, "%s,%s,count,%lu\n", mp->tag, uuidstr, real_log_size) < 0) goto measurement_io_error;
+  if (fprintf(ftxt,  "%s,%s,avg,%f\n",  mp->tag, uuidstr, avg) < 0) goto measurement_io_error;
+  if (fprintf(ftxt,  "%s,%s,min,%lu\n", mp->tag, uuidstr, min) < 0) goto measurement_io_error;
+  if (fprintf(ftxt,  "%s,%s,max,%lu\n", mp->tag, uuidstr, max) < 0) goto measurement_io_error;
+  if (fprintf(ftxt,  "%s,%s,med,%lu\n", mp->tag, uuidstr, med) < 0) goto measurement_io_error;
+  if (fprintf(ftxt,  "%s,%s,q25,%lu\n", mp->tag, uuidstr, q25) < 0) goto measurement_io_error;
+  if (fprintf(ftxt,  "%s,%s,q75,%lu\n", mp->tag, uuidstr, q75) < 0) goto measurement_io_error;
+  if (fprintf(ftxt,  "%s,%s,q99,%lu\n", mp->tag, uuidstr, q99) < 0) goto measurement_io_error;
+  if (fclose(ftxt) != 0) goto measurement_io_error;
 
-  uint64_t q75 = real_log[(int)(0.75 * real_log_size)];
-  fprintf(stdout, "%s,%s,q75,%lu\n", mp->tag, uuidstr, q75);
+  printf("saved aggregated data as %s\n", txt);
+  return;
 
-  uint64_t q99 = real_log[(int)(0.99 * real_log_size)];
-  fprintf(stdout, "%s,%s,q99,%lu\n", mp->tag, uuidstr, q99);
+measurement_io_error:
+  perror("an io error occured while writing measurement results");
+  exit(EXIT_FAILURE);
 }