Graph is not been shown after hiding other lines

Hi,
I am trying to build a simple graph with line chart. The data is as follows :

**var chart = c3.generate({
data: {
columns: [
["data1", 26215486, 113143481, 108414358, 115456558, 105712268, 115723153],
["data2", 20079235, 78014461, 76462372, 81040896, 75049285, 80514590],
["data3", 101504641, 396488482, 323120625, 340598418, 352155274, 360210597],
["data4", 1.31, 1.45, 1.42, 1.42, 1.41, 1.44],
["data5", 3.87, 3.50, 2.98, 2.95, 3.33, 3.11]
]
}
});**

However when I hide data1,data2 and data3 by clicking on corresponding legends, nothing is showing in the graph. As data4 and data5 values are very small compared to others, I can see the Y axis tries to adjust the values and those 2 lines are going up very fast and disappear in no time.

Any help would be appreciated.