I have 6 figures in a 2 by 3 minipage like below

```
\begin{minipage}
   \subfloat[]  
   \subfloat[] 
   \subfloat[]
   \quad
   \subfloat[]
   \subfloat[]
   \subfloat[]
\end{minipage}

```

This structure labels subfloat as

```
a b c
d e f

```

How I can get subfloats labeled as below ?

```
a c e
b d e

```