diff --git a/docs/changes/1.3.0.md b/docs/changes/1.3.0.md
index 37f70684d..de3aa4954 100644
--- a/docs/changes/1.3.0.md
+++ b/docs/changes/1.3.0.md
@@ -18,6 +18,7 @@
 
 ## Bug fixes
 - PowerPoint2007 Reader : Fixed a node taken out of a node list being treated as an element without being asked whether it is one, which `phpoffice/common` 1.1.0 no longer promises, by [@dkulyk](http://github.com/dkulyk) in [#1000](https://github.com/PHPOffice/PHPPresentation/pull/1000)
+- PowerPoint2007 Writer : Fixed `Font::BASELINE_SUPERSCRIPT` and `Font::BASELINE_SUBSCRIPT` being ten times too large, which raised a superscript by 300% and dropped a subscript by 250%, putting it on a line of its own, by [@dkulyk](http://github.com/dkulyk) fixing [#997](https://github.com/PHPOffice/PHPPresentation/issues/997) in [#998](https://github.com/PHPOffice/PHPPresentation/pull/998)
 - PowerPoint2007 Reader : Fixed a colour with an alpha coming back opaque and one character short, taking the first digit of the colour with it, by [@dkulyk](http://github.com/dkulyk) in [#961](https://github.com/PHPOffice/PHPPresentation/pull/961)
 - Both Writers : Fixed a second shape holding the same picture, and a second chart holding the same numbers, being written as a reference to a part that was never put in the archive, which is what PowerPoint offers to repair, by [@dkulyk](http://github.com/dkulyk) in [#948](https://github.com/PHPOffice/PHPPresentation/pull/948)
 - PowerPoint2007 Writer : Fixed a group taking two shape identifiers and using the second, leaving a number no shape carries, by [@dkulyk](http://github.com/dkulyk) in [#947](https://github.com/PHPOffice/PHPPresentation/pull/947)
diff --git a/docs/usage/styles.md b/docs/usage/styles.md
index ff6522cb0..d14e9b8cd 100644
--- a/docs/usage/styles.md
+++ b/docs/usage/styles.md
@@ -158,12 +158,12 @@ echo $alignment->isRTL();
 ### Baseline
 
 The baseline set the position relative to the line.
-The value is a percentage.
+The value is a percentage in thousandths, so `30000` is 30% of the font size.
 
 You can use some predefined values :
 
-* `Font::BASELINE_SUPERSCRIPT` (= 300000 = 300%)
-* `Font::BASELINE_SUBSCRIPT` (= -250000 = -250%)
+* `Font::BASELINE_SUPERSCRIPT` (= 30000 = 30%)
+* `Font::BASELINE_SUBSCRIPT` (= -25000 = -25%)
 
 
 ### Capitalization
diff --git a/src/PhpPresentation/Style/Font.php b/src/PhpPresentation/Style/Font.php
index 27fc252e9..73d898b18 100644
--- a/src/PhpPresentation/Style/Font.php
+++ b/src/PhpPresentation/Style/Font.php
@@ -68,8 +68,8 @@ class Font implements ComparableInterface
     public const UNDERLINE_WORDS = 'words';
 
     // Script sub and super values
-    public const BASELINE_SUPERSCRIPT = 300000;
-    public const BASELINE_SUBSCRIPT = -250000;
+    public const BASELINE_SUPERSCRIPT = 30000;
+    public const BASELINE_SUBSCRIPT = -25000;
 
     /**
      * Name.
diff --git a/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptChartsTest.php b/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptChartsTest.php
index f84c014a2..37f717e46 100644
--- a/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptChartsTest.php
+++ b/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptChartsTest.php
@@ -1172,7 +1172,7 @@ public function testTypeBar3DSubScript(): void
 
         $element = '/c:chartSpace/c:chart/c:plotArea/c:bar3DChart/c:ser/c:dLbls/c:txPr/a:p/a:pPr/a:defRPr';
         $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
-        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '-250000');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '-25000');
         $this->assertIsSchemaECMA376Valid();
     }
 
@@ -1189,7 +1189,7 @@ public function testTypeBar3DSuperScript(): void
 
         $element = '/c:chartSpace/c:chart/c:plotArea/c:bar3DChart/c:ser/c:dLbls/c:txPr/a:p/a:pPr/a:defRPr';
         $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
-        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '300000');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '30000');
         $this->assertIsSchemaECMA376Valid();
     }
 
@@ -1597,7 +1597,7 @@ public function testTypeLineSubScript(): void
 
         $element = '/c:chartSpace/c:chart/c:plotArea/c:lineChart/c:ser/c:dLbls/c:txPr/a:p/a:pPr/a:defRPr';
         $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
-        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '-250000');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '-25000');
 
         $this->assertIsSchemaECMA376Valid();
     }
@@ -1615,7 +1615,7 @@ public function testTypeLineSuperScript(): void
 
         $element = '/c:chartSpace/c:chart/c:plotArea/c:lineChart/c:ser/c:dLbls/c:txPr/a:p/a:pPr/a:defRPr';
         $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
-        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '300000');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '30000');
 
         $this->assertIsSchemaECMA376Valid();
     }
@@ -1723,7 +1723,7 @@ public function testTypePie3DSubScript(): void
 
         $element = '/c:chartSpace/c:chart/c:plotArea/c:pie3DChart/c:ser/c:dLbls/c:txPr/a:p/a:pPr/a:defRPr';
         $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
-        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '-250000');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '-25000');
 
         $this->assertIsSchemaECMA376Valid();
     }
@@ -1741,7 +1741,7 @@ public function testTypePie3DSuperScript(): void
 
         $element = '/c:chartSpace/c:chart/c:plotArea/c:pie3DChart/c:ser/c:dLbls/c:txPr/a:p/a:pPr/a:defRPr';
         $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
-        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '300000');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '30000');
 
         $this->assertIsSchemaECMA376Valid();
     }
@@ -2007,7 +2007,7 @@ public function testTypeScatterSubScript(): void
 
         $element = '/c:chartSpace/c:chart/c:plotArea/c:scatterChart/c:ser/c:dLbls/c:txPr/a:p/a:pPr/a:defRPr';
         $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
-        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '-250000');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '-25000');
 
         $this->assertIsSchemaECMA376Valid();
     }
@@ -2025,7 +2025,7 @@ public function testTypeScatterSuperScript(): void
 
         $element = '/c:chartSpace/c:chart/c:plotArea/c:scatterChart/c:ser/c:dLbls/c:txPr/a:p/a:pPr/a:defRPr';
         $this->assertZipXmlElementExists('ppt/charts/' . $oShape->getIndexedFilename(), $element);
-        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '300000');
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'baseline', '30000');
 
         $this->assertIsSchemaECMA376Valid();
     }
diff --git a/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptSlidesTest.php b/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptSlidesTest.php
index 709c18898..ef23719c0 100644
--- a/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptSlidesTest.php
+++ b/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptSlidesTest.php
@@ -1695,7 +1695,7 @@ public function testStyleSubScript(): void
 
         $element = '/p:sld/p:cSld/p:spTree/p:sp/p:txBody/a:p/a:r/a:rPr';
         $this->assertZipXmlElementExists('ppt/slides/slide1.xml', $element);
-        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $element, 'baseline', '-250000');
+        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $element, 'baseline', '-25000');
         $this->assertIsSchemaECMA376Valid();
     }
 
@@ -1708,7 +1708,7 @@ public function testStyleSuperScript(): void
 
         $element = '/p:sld/p:cSld/p:spTree/p:sp/p:txBody/a:p/a:r/a:rPr';
         $this->assertZipXmlElementExists('ppt/slides/slide1.xml', $element);
-        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $element, 'baseline', '300000');
+        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $element, 'baseline', '30000');
         $this->assertIsSchemaECMA376Valid();
     }