I want to merge two plots, that is my dataframe:
 `df_inc.head()`

```
id  date    real_exe_time   mean    mean+30%    mean-30%
0   Jan           31        33.14   43.0         23.0
1   Jan           30        33.14   43.0         23.0
2   Jan           33        33.14   43.0         23.0
3   Jan           38        33.14   43.0         23.0
4   Jan           36       33.14    43.0         23.0

```

My first plot:
`df_inc.plot.scatter(x = 'date', y = 'real_exe_time')`

[![scatter](https://i.stack.imgur.com/bhYOh.png)](https://i.stack.imgur.com/bhYOh.png)

Then

My second plot:
`df_inc.plot(x='date', y=['mean','mean+30%','mean-30%'])`

[![lines](https://i.stack.imgur.com/yFdPq.png)](https://i.stack.imgur.com/yFdPq.png)

When I try to merge with:

```
fig=plt.figure()
ax = df_inc.plot(x='date', y=['mean','mean+30%','mean-30%']);
df_inc.plot.scatter(x = 'date', y = 'real_exe_time', ax=ax)

plt.show()

```

I got the following:

[![fail](https://i.stack.imgur.com/6RZmT.png)](https://i.stack.imgur.com/6RZmT.png)

How I can merge the right way?