diff --git a/example/wham.out b/example/wham.out
new file mode 100644
index 0000000..5462b93
--- /dev/null
+++ b/example/wham.out
@@ -0,0 +1,101 @@
+#x       	Free Energy	Probability
+-3.108600	7.118132	0.003561
+-3.045800	5.331257	0.007290
+-2.983000	3.879200	0.013048
+-2.920200	2.968630	0.018797
+-2.857400	1.942463	0.028363
+-2.794600	1.418379	0.034994
+-2.731800	1.169367	0.038668
+-2.669000	0.842997	0.044073
+-2.606200	0.635996	0.047887
+-2.543400	0.720100	0.046299
+-2.480600	1.066414	0.040297
+-2.417800	1.509836	0.033734
+-2.355000	2.015530	0.027544
+-2.292200	2.226925	0.025306
+-2.229400	2.573162	0.022026
+-2.166600	2.591932	0.021861
+-2.103800	2.476822	0.022893
+-2.041000	2.513943	0.022555
+-1.978200	2.470026	0.022956
+-1.915400	2.227577	0.025299
+-1.852600	2.105305	0.026570
+-1.789800	1.778774	0.030286
+-1.727000	1.447121	0.034593
+-1.664200	0.906382	0.042968
+-1.601400	0.304258	0.054699
+-1.538600	0.247396	0.055960
+-1.475800	0.000000	0.061795
+-1.413000	0.536140	0.049843
+-1.350200	1.428043	0.034859
+-1.287400	2.398146	0.023627
+-1.224600	3.784645	0.013552
+-1.161800	5.696583	0.006297
+-1.099000	7.656155	0.002870
+-1.036200	9.954992	0.001142
+-0.973400	12.357405	0.000436
+-0.910600	14.954249	0.000154
+-0.847800	17.745319	0.000050
+-0.785000	20.559460	0.000016
+-0.722200	22.783556	0.000007
+-0.659400	25.175858	0.000003
+-0.596600	26.419977	0.000002
+-0.533800	27.885994	0.000001
+-0.471000	29.029327	0.000001
+-0.408200	30.366552	0.000000
+-0.345400	31.615246	0.000000
+-0.282600	32.781708	0.000000
+-0.219800	33.731373	0.000000
+-0.157000	34.476006	0.000000
+-0.094200	35.387291	0.000000
+-0.031400	35.579746	0.000000
+0.031400	35.520184	0.000000
+0.094200	35.344753	0.000000
+0.157000	34.886452	0.000000
+0.219800	33.633987	0.000000
+0.282600	32.686501	0.000000
+0.345400	31.211767	0.000000
+0.408200	29.680437	0.000000
+0.471000	28.032228	0.000001
+0.533800	26.439589	0.000002
+0.596600	24.432449	0.000003
+0.659400	22.309877	0.000008
+0.722200	20.186028	0.000019
+0.785000	18.295029	0.000040
+0.847800	16.221214	0.000093
+0.910600	14.251888	0.000204
+0.973400	12.562330	0.000402
+1.036200	11.184008	0.000698
+1.099000	10.040657	0.001103
+1.161800	9.369045	0.001444
+1.224600	9.095373	0.001612
+1.287400	9.256014	0.001511
+1.350200	9.814045	0.001208
+1.413000	10.945183	0.000768
+1.475800	12.518873	0.000409
+1.538600	14.409716	0.000191
+1.601400	16.451935	0.000084
+1.664200	18.589132	0.000036
+1.727000	20.669479	0.000016
+1.789800	22.804764	0.000007
+1.852600	24.531662	0.000003
+1.915400	26.182583	0.000002
+1.978200	27.279408	0.000001
+2.041000	28.571348	0.000001
+2.103801	29.328941	0.000000
+2.166600	29.897709	0.000000
+2.229400	30.320875	0.000000
+2.292200	30.065357	0.000000
+2.355000	29.809101	0.000000
+2.417800	29.340567	0.000000
+2.480600	28.473312	0.000001
+2.543401	27.679312	0.000001
+2.606200	26.453121	0.000002
+2.669000	24.424610	0.000003
+2.731800	22.285896	0.000008
+2.794600	19.958370	0.000021
+2.857400	17.606255	0.000053
+2.920201	15.420090	0.000128
+2.983001	13.069551	0.000328
+3.045800	11.036041	0.000740
+3.108600	9.015614	0.001664