I have the following data in my thesis:

```
28 45
91 14
102 11
393 5
4492 1.77

```

I need to fit a curve into this. If I plot it, then this is what I get.

![enter image description here](https://i.stack.imgur.com/76Lq0.png)

I think some kind of exponential curve should fit this data. I am using GNUplot. Can someone tell me what kind of curve will fit this and what initial parameters I can use?