<p>when I plotting the volcano plot, I got some dots very top of the Y-axis because their padj nearly reached 0（I checked the data, I think they are reliable）, so I followed the advice to add a very small value to padj(machine$double.xmin), but still got those dots formed a line. I think I heard these lines have a name like Texas arm(?) or Tech arm(?) something before, but I can't remember. Can someone tell me what's the name?
Please help me. here is the plot :
<a href="https://i.sstatic.net/x1r6d.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/x1r6d.png" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2021-01-14T11:04:30.240Z
If there's a name for that then it's so obscure that if you used it in a paper the reviewers would have to google for it.
Devon Ryan
CC BY-SA 4.0
2021-01-15T09:30:10.870Z
@DevonRyan Yes, I think you are right. Maybe I'm misremembering. Anyway, thank you for your help!
Chu
<differential-expression><ggplot2>
How to call this : some dots in volcano plot aligned a line after add a very small value to padj
# How to call this : some dots in volcano plot aligned a line after add a very small value to padj

(Asked by: username_0 on 2021-01-13)

when I plotting the volcano plot, I got some dots very top of the Y-axis because their padj nearly reached 0（I checked the data, I think they are reliable）, so I followed the advice to add a very small value to padj(machine$double.xmin), but still got those dots formed a line. I think I heard these lines have a name like Texas arm(?) or Tech arm(?) something before, but I can't remember. Can someone tell me what's the name?
Please help me. here is the plot :
[![enter image description here](https://i.sstatic.net/x1r6d.png)](https://i.sstatic.net/x1r6d.png)

**Tags:** differential-expression, ggplot2
> **Comments:**
> **username_1**: If there's a name for that then it's so obscure that if you used it in a paper the reviewers would have to google for it.  
> **username_0**: @DevonRyan Yes, I think you are right. Maybe I'm misremembering. Anyway, thank you for your help!  

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## 0 answers

