diff --git a/inst/case/abundance.csv b/inst/case/abundance.csv
new file mode 100644
index 0000000..ff22cb1
--- /dev/null
+++ b/inst/case/abundance.csv
@@ -0,0 +1,72 @@
+time,paramecium,didinium
+0,15.65,5.76
+0.52,53.57,9.05
+1.01,73.34,17.26
+1.54,93.93,41.97
+2.04,115.4,55.97
+2.51,76.57,74.91
+3,32.83,62.52
+3.46,23.74,27.04
+3.97,56.7,18.77
+4.5,86.37,31.11
+4.95,121,58.31
+5.47,71.48,73.13
+5.99,55.78,63.21
+6.46,31.84,52.46
+6.98,26.87,40.07
+7.45,53.24,27.67
+7.95,65.59,26
+8.5,81.23,24.32
+8.96,143.9,21
+9.49,237.9,33.35
+10,276.6,64.67
+10.47,222.2,94.34
+10.96,137.2,103.4
+11.47,46.45,82.74
+11.96,27.46,65.4
+12.46,41.46,51.35
+12.95,44.73,28.24
+13.46,88.42,23.27
+13.98,105.7,38.09
+14.49,155.2,14.97
+15.02,205.5,24.84
+15.51,312.7,49.56
+16.02,213.7,75.93
+15.99,163.4,104
+17,85.78,106.4
+17.52,48.64,100.6
+18.05,44.49,84.08
+18.51,63.44,45.3
+19.06,71.66,35.37
+19.51,127.7,35.35
+20.05,206.9,41.1
+20.54,309.9,52.62
+21.1,156.5,120.2
+21.56,63.3,112.8
+22.06,77.29,92.14
+22.52,45.11,65.72
+23.02,57.45,33.54
+23.54,69.8,21.14
+24.04,121.7,17.82
+24.58,185.2,26.04
+25.08,175.3,65.61
+25.6,139,76.3
+26.04,77.11,96.07
+26.51,57.29,68.84
+27.05,54.79,54.79
+27.55,75.38,35.8
+28.05,87.73,32.48
+28.55,136.4,24.21
+29.04,290.6,35.73
+29.55,345.8,55.5
+30.04,271.6,93.41
+30.59,156.1,117.3
+30.99,71.1,95.02
+31.48,43.86,85.92
+32.03,30.64,82.6
+32.5,35.56,66.08
+33.03,52.03,63.58
+33.49,37.99,37.99
+34.02,62.71,25.6
+34.49,103.9,23.1
+35.08,187.2,37.09