Increase npad to reduce numerical error #183

Job	Run time
Ex1 (3.8, ubuntu-latest, tests/test_dcip.py)	1h 47m 8s
Ex1 (3.8, ubuntu-latest, tests/test_em.py)	5h 17m 31s
Ex1 (3.8, ubuntu-latest, tests/test_gpr.py tests/test_seismic.py)	4h 5m 44s
Ex1 (3.8, ubuntu-latest, tests/test_inversion.py)	35m 38s
Ex1 (3.8, ubuntu-latest, tests/test_gravity.py tests/test_mag.py)	35m 46s
Ex1 (3.10, ubuntu-latest, tests/test_dcip.py)	1m 31s
Ex1 (3.10, ubuntu-latest, tests/test_em.py)	2h 57m 17s
Ex1 (3.10, ubuntu-latest, tests/test_gpr.py tests/test_seismic.py)	4h 41m 8s
Ex1 (3.10, ubuntu-latest, tests/test_inversion.py)	1h 10m 51s
Ex1 (3.10, ubuntu-latest, tests/test_gravity.py tests/test_mag.py)	35m 45s
	21h 48m 19s

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