diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index e906dba6c875..e9e8c3ef25a1 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -3427,13 +3427,17 @@ def extract_err(name, err, data, lolims, uplims):
the note in the main docstring about this parameter's name.
"""
try:
- low, high = np.broadcast_to(err, (2, len(data)))
+ np.broadcast_to(err, (2, len(data)))
except ValueError:
raise ValueError(
f"'{name}err' (shape: {np.shape(err)}) must be a scalar "
f"or a 1D or (2, n) array-like whose shape matches "
f"'{name}' (shape: {np.shape(data)})") from None
- return data - low * ~lolims, data + high * ~uplims # low, high
+ # This is like
+ # low, high = np.broadcast_to(...)
+ # return data - low * ~lolims, data + high * ~uplims
+ # except that broadcast_to would strip units.
+ return data + np.row_stack([-(1 - lolims), 1 - uplims]) * err
if xerr is not None:
left, right = extract_err('x', xerr, x, xlolims, xuplims)
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