From 0b6b8d8683a9fba883c11b22c5d0b2491f4e5a6a Mon Sep 17 00:00:00 2001
From: Tamas Gal <tgal@km3net.de>
Date: Tue, 8 Dec 2020 19:53:34 +0100
Subject: [PATCH] Fix mask_alt

---
 km3io/tools.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/km3io/tools.py b/km3io/tools.py
index cf903fe..b66866e 100644
--- a/km3io/tools.py
+++ b/km3io/tools.py
@@ -325,7 +325,7 @@ def mask(arr, sequence=None, startend=None, minmax=None, atleast=None):
 
 def mask_alt(arr, start, end):
     nonempty = ak.num(arr, axis=-1) > 0
-    mask = (arr.mask[nonempty][..., 0] == start) & (arr.mask[nonempty][..., -1])
+    mask = ((arr.mask[nonempty][..., 0] == start) & (arr.mask[nonempty][..., -1] == end))
     return ak.fill_none(mask, False)
 
 
-- 
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