If you are drawing `with steps`

, the question probably is: which color should the vertical lines have?
Quickly checking the documentation I couldn’t find a hint whether variable line color together `with steps`

explicitely works or explicitely doesn’t work.

In any case, you can workaround with the following code:

**Code:**

```
### plotting with steps and variable line color
reset session
$Data <<EOD
1 0.5 0.1
2 0.75 0.2
3 0.99 0.5
4 1.25 1.1
EOD
set xrange [0:5]
set yrange [0:1.5]
plot x1=y1=NaN $Data u (x0=x1,x1=$1,x0):(y0=y1,y1=$2,y0):(x1-x0):(0):3 w vectors lw 2 lc palette nohead notitle, \
x1=y1=NaN $Data u (x0=x1,x1=$1,x1):(y0=y1,y1=$2,y0):(0):(y1-y0):3 w vectors lw 2 lc palette nohead notitle
### end of code
```

**Result:**

**Addition:** (vertical lines with variable colors)

Maybe you noticed that with your 4 datapoints there are only 3 colors. This is obvious, because if you have 4 data points you will only have 3 connecting lines, hence 3 colors.

A variation would be the following:
Draw your 4 points with the color according to the value column 3 and the same color for the horizontal lines.
However, for the vertical lines you split the lines into as many levels you want (here: `myLevels = 20`

) using the color according to the palette.

**Code:**

```
### plotting with steps and variable line color (vertical lines with variable color)
reset session
$Data <<EOD
1 0.5 0.1
2 0.75 0.2
3 0.99 0.5
4 1.25 1.1
EOD
set xrange [0:5]
set yrange [0:1.5]
myLevels = 20
plot x1=y1=c1=NaN $Data u (x0=x1,x1=$1,x0):(y0=y1,y1=$2,y0):(x1-x0):(0):(c0=c1,c1=$3,c0) w vectors lw 2 lc palette nohead notitle, \
for [i=0:myLevels-1] x1=y1=NaN $Data u (x0=x1,x1=$1,x1):(y0=y1,y1=$2,y0+(y1-y0)*i/myLevels):(0):((y1-y0)/myLevels):(c0=c1,c1=$3,c0+(c1-c0)*i/myLevels) w vectors lw 2 lc palette nohead notitle, \
$Data u 1:2:3 w p pt 7 ps 2 lc palette notitle
### end of code
```

**Result:**

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