gh-391: _naturalspice expects and returns correlation functions (#390)

Author: JaimeRZP

heracles/dices/jackknife.py

@@ -26,7 +26,7 @@
 from ..mapping import transform
 from ..twopoint import angular_power_spectra
 from ..unmixing import _naturalspice, logistic
-from ..transforms import _cl2corr
+from ..transforms import _cl2corr, cl2corr, corr2cl
 
 try:
     from copy import replace
@@ -77,7 +77,9 @@ def jackknife_cls(
             vis_alms_jk = _sum_alms_except(vis_alms_regions, regions)
             _cls_mm = angular_power_spectra(vis_alms_jk)
             alphas = get_mask_correlation_ratio(_cls_mm, mls0, unmixed=unmixed)
-            _cls = _naturalspice(_cls, alphas, fields)
+            _wcls = cl2corr(_cls)
+            _wcls = _naturalspice(_wcls, alphas, fields)
+            _cls = corr2cl(_wcls)
         elif mask_correction == "Fast":
             _cls = correct_footprint_reduction(
                 _cls, jk_maps, fields, *regions, unmixed=unmixed