From fc7921100e6bb66b0367f2c57e7122ace832b918 Mon Sep 17 00:00:00 2001
From: alfon_news <alfon_news@outlook.com>
Date: Tue, 9 Jun 2020 07:51:14 +0200
Subject: [PATCH] Fix siScale imprecision errors (#508)
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* Fix siScale imprecision errors

* Implement 2xB suggested change

Co-authored-by: Alberto Fontán Correa <afontan@com.uvigo.es>
Co-authored-by: Ogi Moore <ognyan.moore@gmail.com>
---
 pyqtgraph/functions.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pyqtgraph/functions.py b/pyqtgraph/functions.py
index 193cce6a..b202e86a 100644
--- a/pyqtgraph/functions.py
+++ b/pyqtgraph/functions.py
@@ -77,7 +77,8 @@ def siScale(x, minVal=1e-25, allowUnicode=True):
             pref = SI_PREFIXES[m+8]
         else:
             pref = SI_PREFIXES_ASCII[m+8]
-    p = .001**m
+    m1 = -3*m
+    p = 10.**m1
     
     return (p, pref)