diff --git a/docs/source/techniques/ISISPowder-Pearl-v1.rst b/docs/source/techniques/ISISPowder-Pearl-v1.rst
index ee71f57ca966176d53511f2f2f6bd3eb7013df02..6966e6ddbdca0e5db4db9fdd6c71034f0098f80f 100644
--- a/docs/source/techniques/ISISPowder-Pearl-v1.rst
+++ b/docs/source/techniques/ISISPowder-Pearl-v1.rst
@@ -789,20 +789,20 @@ On PEARL this is set to the following TOF windows:
 
   # Long mode ON:
         focused_cropping_values: [
-        (20300, 39990),  # Bank 1
-        (20300, 39990),  # Bank 2
-        (20300, 39990),  # Bank 3
-        (20300, 39990),  # Bank 4
-        (20300, 39990),  # Bank 5
-        (20300, 39990),  # Bank 6
-        (20300, 39990),  # Bank 7
-        (20300, 39990),  # Bank 8
-        (20300, 39990),  # Bank 9
-        (20300, 39990),  # Bank 10
-        (20300, 39990),  # Bank 11
-        (20300, 39990),  # Bank 12
-        (20300, 39990),  # Bank 13
-        (20300, 39990)   # Bank 14
+        (20300, 38830),  # Bank 1
+        (20300, 38830),  # Bank 2
+        (20300, 38830),  # Bank 3
+        (20300, 38830),  # Bank 4
+        (20300, 38830),  # Bank 5
+        (20300, 38830),  # Bank 6
+        (20300, 38830),  # Bank 7
+        (20300, 38830),  # Bank 8
+        (20300, 38830),  # Bank 9
+        (20300, 38830),  # Bank 10
+        (20300, 38830),  # Bank 11
+        (20300, 38830),  # Bank 12
+        (20300, 38830),  # Bank 13
+        (20300, 38830)   # Bank 14
       ]
 
 
@@ -987,7 +987,7 @@ On PEARL this is set to the following:
     raw_data_tof_cropping: (0, 19995)
 
   # Long mode ON:
-    raw_data_tof_cropping: (20280, 39995)
+    raw_data_tof_cropping: (20280, 39000)
 
 .. _spline_coefficient_pearl_isis-powder-diffraction-ref:
 
@@ -996,6 +996,7 @@ spline_coefficient
 Determines the spline coefficient to use after processing
 the vanadium in :ref:`create_vanadium_pearl_isis-powder-diffraction-ref`
 method. For more details see: :ref:`SplineBackground <algm-SplineBackground>`
+This value is lower on long-mode to deal with the increased noise.
 
 *Note that if this value is changed 'create_vanadium'
 will need to be called again.*
@@ -1003,8 +1004,10 @@ will need to be called again.*
 On PEARL this is set to the following:
 
 ..  code-block:: python
-
-  spline_coefficient: 60
+  # Long mode OFF:
+    spline_coefficient: 60
+  # Long mode ON:
+    spline_coefficient: 5
 
 .. _subtract_empty_instrument_pearl_isis-powder-diffraction-ref:
 
@@ -1118,6 +1121,6 @@ On PEARL this is set to the following:
   # Long mode OFF:
     vanadium_tof_cropping: (1400, 19990)
   # Long mode ON:
-    vanadium_tof_cropping: (20295, 39993)
+    vanadium_tof_cropping: (20295, 39000)
 
 .. categories:: Techniques