Update file README.md

Power sensor holder for Zeiss Lightsheet 7/README.md

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 Power sensor holder developed for Zeiss Light sheet 7. It is compatible with the model X-Cite XR2100 power sensor. 
 This is used for routine laser power measurements on this Zeiss microscope system.
 
-![3D model of power sensor holder](image.png)
+**3D model of power sensor holder:**
+<img src="image.png" width=70%>
+
+**Printed holder placed in the microscope:**
+<img src="image-1.png" width=70%>
 
-![Printed holder placed in the microscope](image-1.png) 
 ## How to use
 
 The dimensions of this model are similar to the chambers used for imaging in this microscope system. It can be used for both right and left side illuminations. This holder is designed in a way that the Light sheet will be centered in the power sensor window (see software settings below in more detail).
 
 To measure laser power from the right-side illumination, place the laser power sensor in the slit on the right side, with the sensor window facing left (user perspective), as shown in the photo:
 
-![Sensor and holder position for right illumination](image-2.png)
+**Sensor position for right illumination:**
+<img src="image-2.png" width=70%>
+
 
 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:
 
-![alt tex](image-3.png)
+**Sensor position for right illumination:**
+<img src="image-3.png" width=70%>
 
 ### Software settings