diff --git a/SOPHIE-Alignment.md b/SOPHIE-Alignment.md
index 6b30df2..10d0c12 100644
--- a/SOPHIE-Alignment.md
+++ b/SOPHIE-Alignment.md
@@ -12,7 +12,7 @@ The consequences of an energy drift include:
 - **Misaligned data**: The data stacks must be aligned image-by-image in order to correctly interpret the observations.
 - **Image Padding Requirements**: Image stacks require padding in order to keep features of interest within the measured area over the full energy range.
 - **Limited Fine-stage Movement**: A large virtual drift will apply a significant feedback voltage which can push the limits of the sample fine stage and cause a mismatch between the calculate scan-tile regions and the achievable fine stage regions.
-- **Noisy Users**: Complaints during experiments, complaints during analysis, complaints in articles.
+- **Excessive Noise**: Complaints during experiments, complaints during analysis, complaints in articles.
 
 There are a number of strategies for dealing with energy drift:
 - **Post-fix**: Simply align the images during the data analysis.
@@ -22,6 +22,7 @@ There are a number of strategies for dealing with energy drift:
 
 
 ## The SOPHIE Endstation
+
 The SOPHIE endstation uses a novel interferometer design where:
 1. The measured axes are not along the X and Y axes, but inclined by 45° (rotated about the Z-axis). The interferometer measurements are transformed into X and Y positions in software (Orocos), which will be referred to as the **J and K axes**.
 2. The beam-splitter for the ZP stage is fixed to the ZP-Z stage and so the laser beam's contact point travels along the outer reference mirror when the ZP-Z stage moves.
@@ -29,14 +30,18 @@ The SOPHIE endstation uses a novel interferometer design where:
 
 | ![Interferometer_Schematic.svg](uploads/76677416d91bb6052882bbc0a687a685/Interferometer_Schematic.svg) |
 |:--:|
-| Figure 1. Schematic of the SOPHIE position-interferometer design. |
+| Figure 1. Schematic of the SOPHIE position-interferometer design. The red and blue lines are the two orthogonal linear polarisations of the laser beam and their reflections from the polarising beamsplitters (yellow) are offset to clarify the beam trajectories. The green objects are quarter-wave plates that rotate the beam polarisation by 45°. |
 
 | ![SOPHIE_interferometer](uploads/43bfb17f3f46e87154275bf1e8b9672b/SOPHIE_interferometer.png) |
 |:--:|
-| Figure 2. Render of the interferometer parts in SOPHIE. |
+| Figure 2. Render of the interferometer parts in SOPHIE. The current discussion centers on the XY-position interferometers while the Z-position and angle interferometers do not affect the drift issues. |
 
 In this design the virtual drift is determined by the long reference mirrors in the upstream, lower corners of the vacuum chamber. The initial mirror alignment involved setting the reference mirror parallel to the corresponding mirror mounted on the ZP stage.
 
+|  |
+|:--:|
+| Figure 3. Design drawings and 3D render of the reference mirrors. |
+
 
 ## Fixing the SOPHIE Alignment