diff --git a/daq.c b/daq.c
index 7e2f892..681bfd5 100644
--- a/daq.c
+++ b/daq.c
@@ -37,9 +37,9 @@ int sensConf(unsigned char uartNumber, int baudRate, unsigned char mode[], unsig
 int DAQ(int t_hrs, int sp_s)
 {
   FILE* dfp;                                    // create a file pointer
-  const char colums[200] = "t(s)\tCO2 uf(ppm)\tCO2(ppm)\tCO uf(ppm)\t"\
-                           "CO(ppm)\tppO2(mbar)\tO2(%%)\tT C0(°C*10)\t"\
-                           "T O2(°C)\tP C0(.mBar)\tP 02(mBar)\tRH(.)\n";
+  const char data_header[200] =
+      "t\tCO2\tCO2 f\tCO\tCO f\tO2\tO2\tT CO\tT O2\tP CO\tP O2\tRH\n"\
+      "s\tppm\tppm\tppm\tppm\tppm\t%\t°C*10\t°C\tmBar\tmBar\t%";
   char co2_uf[10]="",   co2_f[10]="",
                 co_uf[10]="",    co_f[10]="",
                 o2_ppm[10]="",   o2_xcent[10]="",