# Re: [ferret_users] how to draw a straight line on a plot?

```PPL ALINE is unreliable, especially when dealing with time axes.

A better way to do this is to use the {...} syntax:

plot/vs/over/nolab/line=1 {100,100},{`bottom`,`top`}

or, to draw several dashed lines at 15-day intervals:

```
repeat/t=1-may-2004:1-jul-2005:15 plot/vs/over/nolab/line=1/dash=(. 1,.1,.1,.1) {`t[gt=your_variable]`,`[gt=your_variable]`}, {`bottom`,`top`}
```
Billy K

On 12Jul 2007, at 2:23 PM, jimmyc@xxxxxxxxxxx wrote:

```
```Hi-
You can use:
ppl aline/user 1,1,100,1,100

jimmyc

On Thu, 12 Jul 2007, Zibiao Zhang wrote:

```
```Hi All,
How can you draw vertical or horizontal straight lines on a plot? for
```
example, the I range is 1:500, how can I draw a vertical line at I=100?
```
```
This may be a super easy stupid question, but really bothered me for a
```while. Please help!

Zibiao

```
```
--
James Correia, Jr. PhD.
Email: jimmyc @ iastate.edu
Email: jimmyc42 @ gmail.com
Web: http://bruce.agron.iastate.edu/jimmyc/
*********************************************

```
"Wisdom. Strength. Courage. Generosity. Each of us are born with one of
```these. We must find the other three inside of us."
from "Into the West"
```
```

```