diff --git a/CHANGES/v2.4.md b/CHANGES/v2.4.md
index 258642af3cd538921625372f4fac9364c6be56c0..ef91fd3532d032d23921dd7a05fded55af276476 100644
--- a/CHANGES/v2.4.md
+++ b/CHANGES/v2.4.md
@@ -235,4 +235,5 @@ For users:
 For users:
   - Fixed a bug in \ref COORDINATIONNUMBER where derivatives were wrong when using R_POWER > 2, thanks to @MoleOrbitalHybridAnalyst for spotting and fixing
   - Fixed a bug in library search, possibly affecting linked blas/lapack on OSX (see \issue{476}).
+  - Fixed a bug in \ref METAD with `TARGET` and `GRID_SPARSE` (see \issue{467}).
 
diff --git a/regtest/basic/rt65/TARGET2.reference b/regtest/basic/rt65/TARGET2.reference
new file mode 100644
index 0000000000000000000000000000000000000000..b4092d05739e6af016771dadb42c0b7351ef6500
--- /dev/null
+++ b/regtest/basic/rt65/TARGET2.reference
@@ -0,0 +1,14 @@
+#! FIELDS time e1 sigma_e1 height biasf
+#! SET multivariate false
+#! SET kerneltype gaussian
+#! SET min_e1 -pi
+#! SET max_e1 pi
+                  0.002     -1.903205551688819                   0.15  9.109750009330055e-06                     -1
+                  0.004      -2.96314509497333                   0.15  1.185709146847737e-05                     -1
+                  0.006     -2.563611512401551                   0.15  3.459682279642131e-06                     -1
+                  0.008     -3.120966152841994                   0.15  2.627063088737373e-05                     -1
+                   0.01     -2.640309461910613                   0.15  3.857669512410835e-06                     -1
+                  0.012     -2.981598623047649                   0.15   1.18570902777194e-05                     -1
+                  0.014      -1.30629526983071                   0.15  2.684491613922633e-05                     -1
+                  0.016     -2.503951571795555                   0.15  3.399120208955464e-06                     -1
+                  0.018     -3.014247277468189                   0.15  1.387646340580046e-05                     -1
diff --git a/regtest/basic/rt65/plumed.dat b/regtest/basic/rt65/plumed.dat
index 600987c8b3f94ca7a8cb1b60fb3da8d59158df2b..0d4a46fb804667739a60d25e7ae004018f468d89 100644
--- a/regtest/basic/rt65/plumed.dat
+++ b/regtest/basic/rt65/plumed.dat
@@ -4,4 +4,6 @@ e1: TORSION ATOMS=@epsilon-1
 
 t: METAD ARG=e1 SIGMA=0.15 PACE=1 TAU=200 DAMPFACTOR=100 TARGET=tgt_e1 GRID_MIN=-pi GRID_MAX=pi GRID_BIN=200 FILE=TARGET TEMP=300
 
+t2: METAD ARG=e1 SIGMA=0.15 PACE=1 TAU=200 DAMPFACTOR=100 TARGET=tgt_e2 GRID_MIN=-pi GRID_MAX=pi GRID_BIN=200 FILE=TARGET2 TEMP=300 GRID_SPARSE
+
 DUMPATOMS ATOMS=@nucleic FILE=nucleic.xyz
diff --git a/regtest/basic/rt65/tgt_e2 b/regtest/basic/rt65/tgt_e2
new file mode 100644
index 0000000000000000000000000000000000000000..49b5f58a4bbe55af7e4f08d83e64d10697aa4a38
--- /dev/null
+++ b/regtest/basic/rt65/tgt_e2
@@ -0,0 +1,205 @@
+#! FIELDS e1 t2.target der_e1
+#! SET min_e1 -pi
+#! SET max_e1 pi
+#! SET nbins_e1  200
+#! SET periodic_e1 true
+ -3.14159 5.10076 -12.70892
+ -3.11018 4.70239 -12.67962
+ -3.07876 4.30407 -12.68027
+ -3.04734 3.90566 -12.65820
+ -3.01593 3.50873 -12.56070
+ -2.98451 3.11645 -12.34584
+ -2.95310 2.73302 -11.98905
+ -2.92168 2.36315 -11.48303
+ -2.89026 2.01152 -10.83462
+ -2.85885 1.68239 -10.06301
+ -2.82743 1.37924 -9.19536
+ -2.79602 1.10463 -8.25853
+ -2.76460 0.86035 -7.27827
+ -2.73319 0.64733 -6.27846
+ -2.70177 0.46586 -5.27871
+ -2.67035 0.31565 -4.29520
+ -2.63894 0.19598 -3.33913
+ -2.60752 0.10585 -2.41815
+ -2.57611 0.04405 -1.53788
+ -2.54469 0.00922 -0.70101
+ -2.51327 0.00000 0.09104
+ -2.48186 0.01494 0.83725
+ -2.45044 0.05261 1.53656
+ -2.41903 0.11149 2.18707
+ -2.38761 0.19002 2.78648
+ -2.35619 0.28657 3.33221
+ -2.32478 0.39939 3.82147
+ -2.29336 0.52667 4.25183
+ -2.26195 0.66654 4.62342
+ -2.23053 0.81717 4.93553
+ -2.19911 0.97665 5.18839
+ -2.16770 1.14317 5.38294
+ -2.13628 1.31487 5.51695
+ -2.10487 1.48981 5.58462
+ -2.07345 1.66576 5.57692
+ -2.04203 1.84022 5.48097
+ -2.01062 2.01014 5.28380
+ -1.97920 2.17221 4.97850
+ -1.94779 2.32295 4.56436
+ -1.91637 2.45899 4.05604
+ -1.88496 2.57780 3.48558
+ -1.85354 2.67800 2.90046
+ -1.82212 2.76004 2.35978
+ -1.79071 2.82627 1.92248
+ -1.75929 2.88083 1.64450
+ -1.72788 2.92960 1.56915
+ -1.69646 2.97943 1.71195
+ -1.66504 3.03716 2.07025
+ -1.63363 3.10950 2.62387
+ -1.60221 3.20203 3.33816
+ -1.57080 3.31925 4.17143
+ -1.53938 3.46413 5.07054
+ -1.50796 3.63784 5.97985
+ -1.47655 3.83984 6.84656
+ -1.44513 4.06801 7.62050
+ -1.41372 4.31866 8.25743
+ -1.38230 4.58685 8.73061
+ -1.35088 4.86722 9.03758
+ -1.31947 5.15470 9.20074
+ -1.28805 5.44532 9.27486
+ -1.25664 5.73745 9.33973
+ -1.22522 6.03215 9.47554
+ -1.19381 6.33282 9.75711
+ -1.16239 6.64521 10.22904
+ -1.13097 6.97553 10.90943
+ -1.09956 7.33067 11.77148
+ -1.06814 7.71514 12.75565
+ -1.03673 8.13212 13.79332
+ -1.00531 8.58181 14.77995
+ -0.97389 9.06078 15.61190
+ -0.94248 9.56273 16.16983
+ -0.91106 10.07676 16.32518
+ -0.87965 10.58848 16.02464
+ -0.84823 11.08362 15.28715
+ -0.81681 11.54900 14.17647
+ -0.78540 11.97436 12.86211
+ -0.75398 12.35715 11.57633
+ -0.72257 12.70172 10.55300
+ -0.69115 13.02022 9.88103
+ -0.65973 13.32257 9.50496
+ -0.62832 13.61742 9.40240
+ -0.59690 13.91333 9.43842
+ -0.56549 14.21046 9.44831
+ -0.53407 14.50698 9.34280
+ -0.50265 14.79749 9.04752
+ -0.47124 15.07546 8.52664
+ -0.43982 15.33323 7.74502
+ -0.40841 15.56209 6.80145
+ -0.37699 15.76058 5.80952
+ -0.34558 15.92712 4.90263
+ -0.31416 16.06862 4.15626
+ -0.28274 16.18826 3.55378
+ -0.25133 16.29191 2.98214
+ -0.21991 16.37564 2.29118
+ -0.18850 16.43587 1.31572
+ -0.15708 16.45830 -0.09998
+ -0.12566 16.42959 -1.82144
+ -0.09425 16.34386 -3.60730
+ -0.06283 16.20294 -5.18707
+ -0.03142 16.01795 -6.30761
+ 0.00000 15.80662 -6.83201
+ 0.03142 15.58868 -6.76985
+ 0.06283 15.38125 -6.23660
+ 0.09425 15.19682 -5.36388
+ 0.12566 15.04423 -4.28282
+ 0.15708 14.92772 -3.11155
+ 0.18850 14.84872 -1.93712
+ 0.21991 14.80601 -0.84119
+ 0.25133 14.79587 0.12393
+ 0.28274 14.81380 0.87287
+ 0.31416 14.85071 1.34688
+ 0.34558 14.89842 1.51588
+ 0.37699 14.94596 1.30661
+ 0.40841 14.98052 0.68187
+ 0.43982 14.98880 -0.32791
+ 0.47124 14.95992 -1.69025
+ 0.50265 14.88260 -3.29052
+ 0.53407 14.75317 -4.96947
+ 0.56549 14.57036 -6.58050
+ 0.59690 14.33970 -7.94522
+ 0.62832 14.07115 -8.95276
+ 0.65973 13.77719 -9.54424
+ 0.69115 13.47147 -9.71559
+ 0.72257 13.16674 -9.52214
+ 0.75398 12.87318 -9.04455
+ 0.78540 12.59845 -8.35746
+ 0.81681 12.34806 -7.53288
+ 0.84823 12.12515 -6.63737
+ 0.87965 11.93102 -5.70555
+ 0.91106 11.76666 -4.77067
+ 0.94248 11.63127 -3.85511
+ 0.97389 11.52443 -2.96150
+ 1.00531 11.44519 -2.10886
+ 1.03673 11.39193 -1.30973
+ 1.06814 11.36290 -0.57795
+ 1.09956 11.35562 0.06564
+ 1.13097 11.36702 0.60908
+ 1.16239 11.39388 1.04956
+ 1.19381 11.43297 1.39725
+ 1.22522 11.48168 1.67383
+ 1.25664 11.53814 1.91235
+ 1.28805 11.60183 2.15400
+ 1.31947 11.67348 2.43040
+ 1.35088 11.75454 2.78076
+ 1.38230 11.84820 3.21639
+ 1.41372 11.95663 3.73112
+ 1.44513 12.08264 4.31252
+ 1.47655 12.22760 4.93997
+ 1.50796 12.39302 5.59522
+ 1.53938 12.57915 6.22538
+ 1.57080 12.78417 6.81465
+ 1.60221 13.00733 7.31439
+ 1.63363 13.24375 7.69216
+ 1.66504 13.49064 7.92523
+ 1.69646 13.74171 7.96631
+ 1.72788 13.99118 7.82705
+ 1.75929 14.23350 7.52661
+ 1.79071 14.46409 7.07963
+ 1.82212 14.67832 6.56183
+ 1.85354 14.87639 6.02293
+ 1.88496 15.05676 5.48870
+ 1.91637 15.22125 4.97648
+ 1.94779 15.36943 4.47050
+ 1.97920 15.50214 3.93312
+ 2.01062 15.61656 3.25777
+ 2.04203 15.70683 2.41601
+ 2.07345 15.76836 1.35324
+ 2.10487 15.79186 0.07937
+ 2.13628 15.77335 -1.32078
+ 2.16770 15.70887 -2.78132
+ 2.19911 15.59859 -4.15591
+ 2.23053 15.44775 -5.35838
+ 2.26195 15.26192 -6.29576
+ 2.29336 15.05217 -6.91512
+ 2.32478 14.82742 -7.29068
+ 2.35619 14.59409 -7.47898
+ 2.38761 14.35751 -7.52943
+ 2.41903 14.12100 -7.53571
+ 2.45044 13.88403 -7.59844
+ 2.48186 13.64358 -7.73822
+ 2.51327 13.39782 -7.97864
+ 2.54469 13.14226 -8.41694
+ 2.57611 12.86897 -9.08704
+ 2.60752 12.57131 -9.95794
+ 2.63894 12.24329 -11.01270
+ 2.67035 11.87936 -12.16703
+ 2.70177 11.47881 -13.30580
+ 2.73319 11.04332 -14.32339
+ 2.76460 10.57884 -15.12139
+ 2.79602 10.09323 -15.64548
+ 2.82743 9.59582 -15.88386
+ 2.85885 9.09522 -15.86574
+ 2.89026 8.59895 -15.63372
+ 2.92168 8.11292 -15.24911
+ 2.95310 7.64082 -14.77260
+ 2.98451 7.18473 -14.26221
+ 3.01593 6.74469 -13.77231
+ 3.04734 6.31939 -13.34976
+ 3.07876 5.90590 -13.02634
+ 3.11018 5.50091 -12.81419
diff --git a/src/tools/Grid.cpp b/src/tools/Grid.cpp
index 83ebe69b78328d53e62240f5c8b80fd0cba192a2..8d786dfa0f2821ad671b0a7d8e0047f50b6bec3d 100644
--- a/src/tools/Grid.cpp
+++ b/src/tools/Grid.cpp
@@ -857,6 +857,24 @@ void SparseGrid::writeToFile(OFile& ofile) {
   }
 }
 
+double SparseGrid::getMinValue() const {
+  double minval;
+  minval=0.0;
+  for(auto const & i : map_) {
+    if(i.second<minval) minval=i.second;
+  }
+  return minval;
+}
+
+double SparseGrid::getMaxValue() const {
+  double maxval;
+  maxval=0.0;
+  for(auto const & i : map_) {
+    if(i.second>maxval) maxval=i.second;
+  }
+  return maxval;
+}
+
 
 void Grid::projectOnLowDimension(double &val, std::vector<int> &vHigh, WeightBase * ptr2obj ) {
   unsigned i=0;
diff --git a/src/tools/Grid.h b/src/tools/Grid.h
index 7eb7ba66883f935aad1f9e82d318954a915665a2..6e808816ec068abdf973b149806319190fc9364b 100644
--- a/src/tools/Grid.h
+++ b/src/tools/Grid.h
@@ -279,6 +279,10 @@ public:
   void writeToFile(OFile&);
 
   virtual ~SparseGrid() {}
+
+  virtual double getMaxValue() const;
+  virtual double getMinValue() const;
+
 };
 }