TOFEndcapSharedHits: reduce sigma until exact value is know (#2170)

The current sigma is 1 mm for 100 micron pitch sensor. This may be
unlikely. It also causes slowdowns similar to ones we saw in barrel TOF.

### Briefly, what does this PR introduce?


### What kind of change does this PR introduce?
- [x] Bug fix (issue #__)
- [ ] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __

### Please check if this PR fulfills the following:
- [ ] Tests for the changes have been added
- [ ] Documentation has been added / updated
- [ ] Changes have been communicated to collaborators

### Does this PR introduce breaking changes? What changes might users
need to make to their code?
No

### Does this PR change default behavior?
Yes

---------

Co-authored-by: Honey Khindri <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tommy Chun Yuen Tsang <[email protected]>

Author: 4 people

src/detectors/ECTOF/ECTOF.cc

@@ -1,7 +1,5 @@
-// Copyright 2022, Dmitry Romanov
-// Subject to the terms in the LICENSE file found in the top-level directory.
-//
-//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+// Copyright (C) 2022 - 2025, Dmitry Romanov,  Wouter Deconinck, Kolja Kauder, Barak Schmookler, Honey Khindri, Dmitry Kalinkin
 
 #include <Evaluator/DD4hepUnits.h>
 #include <JANA/JApplication.h>
@@ -54,10 +52,11 @@ void InitPlugin(JApplication* app) {
   app->Add(new JOmniFactoryGeneratorT<SiliconChargeSharing_factory>(
       "TOFEndcapSharedHits", {"TOFEndcapHits"}, {"TOFEndcapSharedHits"},
       {
-          .sigma_mode     = SiliconChargeSharingConfig::ESigmaMode::abs,
-          .sigma_sharingx = 0.1 * dd4hep::cm,
-          .sigma_sharingy = 0.1 * dd4hep::cm,
-          .min_edep       = 0.0 * edm4eic::unit::GeV,
+
+          .sigma_mode     = SiliconChargeSharingConfig::ESigmaMode::rel,
+          .sigma_sharingx = 1,
+          .sigma_sharingy = 1,
+          .min_edep       = 0.001 * dd4hep::keV,
           .readout        = "TOFEndcapHits",
       },
       app));