Edit README.md

Power sensor holder for Zeiss Lightsheet 7/README.md

@@ -5,11 +5,11 @@ This is used for routine laser power measurements on this Zeiss microscope syste
 
 **3D model of power sensor holder:**
 
-<img src="image.png" width=70%>
+<img src="image.png" width=40%>
 
 **Printed holder placed in the microscope:**
 
-<img src="image-1.png" width=70%>
+<img src="image-1.png" width=40%>
 
 ## How to use
 
@@ -19,14 +19,14 @@ To measure laser power from the right-side illumination, place the laser power s
 
 **Sensor position for right illumination:**
 
-<img src="image-2.png" width=70%>
+<img src="image-2.png" width=40%>
 
 
 To measure laser power from the left-side illumination, place the laser power sensor in the slit on the left side, with the sensor window facing right (user perspective), as shown in the photo:
 
 **Sensor position for right illumination:**
 
-<img src="image-3.png" width=70%>
+<img src="image-3.png" width=40%>
 
 ### Software settings