diff --git a/regtest/basic/rt19-mpi/HH.0.reference b/regtest/basic/rt19-mpi/HH.0.reference
index cd7e2034f3a0c37d2516b609690421bc73b74f9b..03c5e114316d53160f57a88eebcab8de8396e702 100644
--- a/regtest/basic/rt19-mpi/HH.0.reference
+++ b/regtest/basic/rt19-mpi/HH.0.reference
@@ -6,7 +6,7 @@
0.2 1.495752022063682 1 0.1 1
#! FIELDS time rmsd0 sigma_rmsd0 height biasf
#! SET multivariate false
- 0.05 1.502409238626139 1 0.1 1
- 0.1 1.503459263811322 1 0.1 1
- 0.15 1.501751446043877 1 0.1 1
- 0.2 1.495752022063682 1 0.1 1
+ 0.050000 1.502409 1.000000 0.100000 1.000000
+ 0.100000 1.503459 1.000000 0.100000 1.000000
+ 0.150000 1.501751 1.000000 0.100000 1.000000
+ 0.200000 1.495752 1.000000 0.100000 1.000000
diff --git a/regtest/basic/rt19-mpi/HH.1.reference b/regtest/basic/rt19-mpi/HH.1.reference
index cd7e2034f3a0c37d2516b609690421bc73b74f9b..03c5e114316d53160f57a88eebcab8de8396e702 100644
--- a/regtest/basic/rt19-mpi/HH.1.reference
+++ b/regtest/basic/rt19-mpi/HH.1.reference
@@ -6,7 +6,7 @@
0.2 1.495752022063682 1 0.1 1
#! FIELDS time rmsd0 sigma_rmsd0 height biasf
#! SET multivariate false
- 0.05 1.502409238626139 1 0.1 1
- 0.1 1.503459263811322 1 0.1 1
- 0.15 1.501751446043877 1 0.1 1
- 0.2 1.495752022063682 1 0.1 1
+ 0.050000 1.502409 1.000000 0.100000 1.000000
+ 0.100000 1.503459 1.000000 0.100000 1.000000
+ 0.150000 1.501751 1.000000 0.100000 1.000000
+ 0.200000 1.495752 1.000000 0.100000 1.000000
diff --git a/regtest/basic/rt19-mpi/plumed.dat b/regtest/basic/rt19-mpi/plumed.dat
index a523fa42c11f792395eab6bc1b35813b39e1722b..0edfa5d0d4ee7671ed023a52fe4e731d275d514d 100644
--- a/regtest/basic/rt19-mpi/plumed.dat
+++ b/regtest/basic/rt19-mpi/plumed.dat
@@ -21,7 +21,7 @@ PRINT ARG=* FILE=COLVAR.res.gz FMT=%6.3f
r1: READ VALUES=rmsd0 FILE=input_colvar.gz
PRINT ARG=r1 STRIDE=10 FILE=CC.gz FMT=%8.4f
-METAD FILE=HH.gz ARG=rmsd0 SIGMA=1 HEIGHT=0.1 PACE=10
+METAD FILE=HH.gz ARG=rmsd0 SIGMA=1 HEIGHT=0.1 PACE=10 FMT=%10.6f
ENDPLUMED
diff --git a/regtest/basic/rt19/HH.reference b/regtest/basic/rt19/HH.reference
index cd7e2034f3a0c37d2516b609690421bc73b74f9b..03c5e114316d53160f57a88eebcab8de8396e702 100644
--- a/regtest/basic/rt19/HH.reference
+++ b/regtest/basic/rt19/HH.reference
@@ -6,7 +6,7 @@
0.2 1.495752022063682 1 0.1 1
#! FIELDS time rmsd0 sigma_rmsd0 height biasf
#! SET multivariate false
- 0.05 1.502409238626139 1 0.1 1
- 0.1 1.503459263811322 1 0.1 1
- 0.15 1.501751446043877 1 0.1 1
- 0.2 1.495752022063682 1 0.1 1
+ 0.050000 1.502409 1.000000 0.100000 1.000000
+ 0.100000 1.503459 1.000000 0.100000 1.000000
+ 0.150000 1.501751 1.000000 0.100000 1.000000
+ 0.200000 1.495752 1.000000 0.100000 1.000000
diff --git a/regtest/basic/rt19/plumed.dat b/regtest/basic/rt19/plumed.dat
index a523fa42c11f792395eab6bc1b35813b39e1722b..0edfa5d0d4ee7671ed023a52fe4e731d275d514d 100644
--- a/regtest/basic/rt19/plumed.dat
+++ b/regtest/basic/rt19/plumed.dat
@@ -21,7 +21,7 @@ PRINT ARG=* FILE=COLVAR.res.gz FMT=%6.3f
r1: READ VALUES=rmsd0 FILE=input_colvar.gz
PRINT ARG=r1 STRIDE=10 FILE=CC.gz FMT=%8.4f
-METAD FILE=HH.gz ARG=rmsd0 SIGMA=1 HEIGHT=0.1 PACE=10
+METAD FILE=HH.gz ARG=rmsd0 SIGMA=1 HEIGHT=0.1 PACE=10 FMT=%10.6f
ENDPLUMED