From e33fbe5b2284f9ed18b4d224b3cea76063895230 Mon Sep 17 00:00:00 2001
From: Baptiste Grimaud <83828302+b-grimaud@users.noreply.github.com>
Date: Wed, 22 Jul 2026 12:55:01 +0200
Subject: [PATCH 1/2] BRW6

---
 src/probeinterface/io.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/probeinterface/io.py b/src/probeinterface/io.py
index 80023693..66dc3e62 100644
--- a/src/probeinterface/io.py
+++ b/src/probeinterface/io.py
@@ -567,7 +567,10 @@ def read_3brain(file: str | Path, mea_pitch: float = None, electrode_width: floa
         num_channels = None
         for key in rf:
             if key.startswith("Well_"):
-                num_channels = len(rf[key]["StoredChIdxs"])
+                if "ExperimentSettings" in rf: # BRW5
+                    num_channels = len(rf[key]["StoredChIdxs"])
+                elif "ExperimentInfo" in rf: # BRW6
+                    num_channels = max(rf[key]["NoisePlateElIdxs"]) + 1
                 break
         assert num_channels is not None, "No Well found in the file"
 

From a1cacfb73265faaceb1ade6cb8188bc953ce1b43 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Wed, 22 Jul 2026 11:51:06 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 src/probeinterface/io.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/probeinterface/io.py b/src/probeinterface/io.py
index 66dc3e62..84924300 100644
--- a/src/probeinterface/io.py
+++ b/src/probeinterface/io.py
@@ -567,9 +567,9 @@ def read_3brain(file: str | Path, mea_pitch: float = None, electrode_width: floa
         num_channels = None
         for key in rf:
             if key.startswith("Well_"):
-                if "ExperimentSettings" in rf: # BRW5
+                if "ExperimentSettings" in rf:  # BRW5
                     num_channels = len(rf[key]["StoredChIdxs"])
-                elif "ExperimentInfo" in rf: # BRW6
+                elif "ExperimentInfo" in rf:  # BRW6
                     num_channels = max(rf[key]["NoisePlateElIdxs"]) + 1
                 break
         assert num_channels is not None, "No Well found in the file"