Question: 统计中航沈飞从2025年03月04日到2025年07月09日，股价跌破10日指数移动平均线的总次数。（平滑系数 alpha 取 2 / (n + 1)；从前 4n 个数据开始计算；初始值用首个数据点）使用不复权价格，写出指标公式，搜集原始数据，计算得出答案，保留四位小数。注意列出原始数据和关键计算过程。
Formula: EMA_t = \alpha * P_t + (1 - \alpha) * EMA_{t-1}，\alpha = 2 / (n + 1)
Data:
date,close,low,high,open
2024-12-27,50.46,50.22,52.5,52.01
2024-12-30,50.1,49.6,51.4,50.59
2024-12-31,50.72,49.6,51.31,49.9
2025-01-02,48.32,47.88,50.17,50.17
2025-01-03,46.34,46.21,48.33,48.03
2025-01-06,45.75,44.91,46.67,46.34
2025-01-07,46.4,45.51,46.5,45.64
2025-01-08,45.06,43.6,46.25,46.2
2025-01-09,47.49,44.51,49.49,44.69
2025-01-10,47.15,46.85,48.48,46.85
2025-01-13,46.93,46.07,47.86,46.5
2025-01-14,48.28,46.88,48.38,46.95
2025-01-15,47.5,47.5,48.43,48.29
2025-01-16,47.16,46.99,47.99,47.59
2025-01-17,47.98,46.9,48.19,47.0
2025-01-20,47.71,47.4,48.09,48.0
2025-01-21,47.0,46.77,47.87,47.76
2025-01-22,46.9,45.59,47.0,46.9
2025-01-23,47.17,46.8,47.45,47.26
2025-01-24,46.93,46.68,47.24,46.83
2025-01-27,46.56,46.35,47.2,47.2
2025-02-05,46.59,45.8,46.97,46.8
2025-02-06,47.95,46.12,48.48,46.55
2025-02-07,47.94,47.44,48.35,47.65
2025-02-10,48.18,47.6,48.28,47.94
2025-02-11,47.2,47.11,48.01,48.01
2025-02-12,47.22,46.57,47.27,47.03
2025-02-13,47.22,47.06,48.02,47.22
2025-02-14,46.31,46.14,47.2,47.0
2025-02-17,45.4,45.1,46.5,46.32
2025-02-18,44.62,44.25,45.46,45.4
2025-02-19,44.92,44.39,44.98,44.61
2025-02-20,45.41,44.43,45.69,44.88
2025-02-21,45.9,45.0,46.23,45.3
2025-02-24,45.36,45.13,45.98,45.86
2025-02-25,44.7,44.25,45.28,45.08
2025-02-26,44.25,43.93,44.67,44.44
2025-02-27,44.05,43.51,44.39,44.3
2025-02-28,43.54,43.49,44.36,44.05
2025-03-03,43.58,43.33,44.07,43.58
2025-03-04,44.88,43.6,45.1,43.8
2025-03-05,44.29,44.11,45.09,44.68
2025-03-06,44.36,44.0,44.54,44.48
2025-03-07,45.32,44.01,46.32,44.25
2025-03-10,45.17,45.01,46.29,45.59
2025-03-11,46.31,44.69,46.61,44.88
2025-03-12,45.45,45.39,46.98,46.31
2025-03-13,45.08,44.77,45.66,45.48
2025-03-14,45.17,44.59,45.44,45.08
2025-03-17,45.24,44.97,46.07,45.17
2025-03-18,44.75,44.7,45.35,45.26
2025-03-19,44.19,44.08,44.79,44.76
2025-03-20,44.45,44.08,45.1,44.1
2025-03-21,43.97,43.68,44.49,44.02
2025-03-24,43.85,43.35,44.25,44.03
2025-03-25,43.77,43.6,44.18,43.83
2025-03-26,43.93,43.56,44.02,43.78
2025-03-27,43.6,43.34,43.99,43.93
2025-03-28,43.42,43.03,43.67,43.6
2025-03-31,42.28,42.26,43.13,42.91
2025-04-01,44.49,43.68,45.13,43.68
2025-04-02,42.9,42.73,44.49,44.49
2025-04-03,42.94,42.53,43.16,42.68
2025-04-07,41.24,39.06,42.63,41.68
2025-04-08,42.0,41.13,42.0,41.22
2025-04-09,44.27,41.66,44.81,41.91
2025-04-10,44.6,43.57,45.1,44.26
2025-04-11,44.83,44.03,44.83,44.6
2025-04-14,44.73,44.16,44.95,44.83
2025-04-15,44.0,43.8,44.51,44.5
2025-04-16,44.48,43.58,44.75,44.7
2025-04-17,44.2,43.96,44.6,44.1
2025-04-18,44.04,43.31,44.18,43.93
2025-04-21,44.2,43.74,44.4,43.83
2025-04-22,43.88,43.73,44.22,44.0
2025-04-23,43.05,43.01,43.97,43.88
2025-04-24,42.68,42.67,43.07,42.99
2025-04-25,42.84,42.31,42.93,42.71
2025-04-28,42.48,42.4,42.83,42.8
2025-04-29,42.67,41.28,43.0,41.5
2025-04-30,42.66,42.4,42.78,42.43
2025-05-06,43.22,42.9,43.5,42.98
2025-05-07,46.01,44.35,47.47,44.4
2025-05-08,48.66,45.13,49.66,46.15
2025-05-09,46.18,46.03,48.5,48.49
2025-05-12,50.07,46.25,50.7,46.58
2025-05-13,47.81,47.54,49.5,49.5
2025-05-14,47.38,46.89,48.19,47.82
2025-05-15,46.92,46.69,47.75,47.09
2025-05-16,47.2,46.83,48.05,46.93
2025-05-19,47.69,47.47,48.96,47.76
2025-05-20,47.68,46.4,48.2,47.29
2025-05-21,47.99,46.89,48.29,47.16
2025-05-22,48.13,47.74,49.86,48.0
2025-05-23,48.01,47.8,48.85,47.8
2025-05-26,48.33,47.55,48.94,48.21
2025-05-27,47.65,47.11,48.59,48.03
2025-05-28,47.25,47.17,48.18,47.51
2025-05-29,47.58,46.93,47.83,47.13
2025-05-30,48.03,46.95,48.66,47.35
2025-06-03,49.38,48.25,50.0,48.5
2025-06-04,49.36,48.8,49.43,49.4
2025-06-05,49.6,48.7,49.93,49.38
2025-06-06,50.0,49.97,51.5,50.5
2025-06-09,54.65,52.57,55.0,53.0
2025-06-10,52.89,52.37,53.81,53.55
2025-06-11,53.39,52.45,53.77,52.87
2025-06-12,53.28,52.96,54.45,53.0
2025-06-13,54.9,53.18,55.35,54.43
2025-06-16,54.49,53.25,55.15,54.9
2025-06-17,55.51,53.75,56.55,54.41
2025-06-18,55.28,54.71,56.87,55.5
2025-06-19,53.47,52.57,54.65,54.65
2025-06-20,53.07,52.77,53.8,53.4
2025-06-23,53.04,52.68,53.77,53.2
2025-06-24,52.9,51.84,54.0,52.0
2025-06-25,53.78,52.92,54.45,52.94
2025-06-26,53.77,53.74,55.28,53.81
2025-06-27,55.05,54.38,56.0,54.47
2025-06-30,58.62,55.6,58.91,55.6
2025-07-01,57.94,56.94,58.64,58.64
2025-07-02,56.67,56.49,57.75,57.46
2025-07-03,57.03,56.18,57.13,56.57
2025-07-04,58.58,56.71,59.82,57.01
2025-07-07,60.1,57.98,60.71,58.59
2025-07-08,59.98,58.55,60.17,59.68
2025-07-09,59.44,59.41,61.28,60.08

Indicator data:
date,10日,close
2025-01-10,47.57813148205245,47.15
2025-01-13,47.460289394406544,46.93
2025-01-14,47.60932768633263,48.28
2025-01-15,47.58944992518124,47.5
2025-01-16,47.511368120602825,47.16
2025-01-17,47.596573916856855,47.98
2025-01-20,47.6171968410647,47.71
2025-01-21,47.504979233598384,47.0
2025-01-22,47.394983009307765,46.9
2025-01-23,47.354077007615444,47.17
2025-01-24,47.276972097139904,46.93
2025-01-27,47.14661353402356,46.56
2025-02-05,47.045411073292,46.59
2025-02-06,47.209881787238906,47.95
2025-02-07,47.34263055319547,47.94
2025-02-10,47.49487954352356,48.18
2025-02-11,47.44126508106473,47.2
2025-02-12,47.40103506632568,47.22
2025-02-13,47.36811959972101,47.22
2025-02-14,47.175734217953554,46.31
2025-02-17,46.8528734510529,45.4
2025-02-18,46.44689645995237,44.62
2025-02-19,46.16927892177921,44.92
2025-02-20,46.03122820872844,45.41
2025-02-21,46.00736853441418,45.9
2025-02-24,45.88966516452069,45.36
2025-02-25,45.673362407335105,44.7
2025-02-26,45.41456924236508,44.25
2025-02-27,45.16646574375324,44.05
2025-02-28,44.87074469943447,43.54
2025-03-03,44.63606384499183,43.58
2025-03-04,44.680415873175136,44.88
2025-03-05,44.60943116896147,44.29
2025-03-06,44.56408004733211,44.36
2025-03-07,44.70152003872627,45.32
2025-03-10,44.78669821350331,45.17
2025-03-11,45.063662174684524,46.31
2025-03-12,45.13390541565097,45.45
2025-03-13,45.12410443098715,45.08
2025-03-14,45.13244907989858,45.17
2025-03-17,45.15200379264429,45.24
2025-03-18,45.078912193981694,44.75
2025-03-19,44.917291795075926,44.19
2025-03-20,44.83232965051667,44.45
2025-03-21,44.675542441331814,43.97
2025-03-24,44.52544381563512,43.85
2025-03-25,44.38809039461055,43.77
2025-03-26,44.30480123195408,43.93
2025-03-27,44.17665555341697,43.6
2025-03-28,44.039081816432066,43.42
2025-03-31,43.719248758898964,42.28
2025-04-01,43.85938534819006,44.49
2025-04-02,43.68495164851913,42.9
2025-04-03,43.54950589424292,42.94
2025-04-07,43.129595731653296,41.24
2025-04-08,42.92421468953451,42.0
2025-04-09,43.16890292780096,44.27
2025-04-10,43.42910239547351,44.6
2025-04-11,43.68381105084195,44.83
2025-04-14,43.87402722341614,44.73
2025-04-15,43.8969313646132,44.0
2025-04-16,44.00294384377443,44.48
2025-04-17,44.03877223581544,44.2
2025-04-18,44.03899546566718,44.04
2025-04-21,44.06826901736405,44.2
2025-04-22,44.03403828693422,43.88
2025-04-23,43.85512223476436,43.05
2025-04-24,43.64146364662538,42.68
2025-04-25,43.49574298360258,42.84
2025-04-28,43.31106244112939,42.48
2025-04-29,43.19450563365131,42.67
2025-04-30,43.097322791169255,42.66
2025-05-06,43.11962773822939,43.22
2025-05-07,43.645149967642226,46.01
2025-05-08,44.55694088261636,48.66
2025-05-09,44.85204254032247,46.18
2025-05-12,45.80076207844566,50.07
2025-05-13,46.16607806418281,47.81
2025-05-14,46.3867911434223,47.38
2025-05-15,46.48373820825461,46.92
2025-05-16,46.61396762493558,47.2
2025-05-19,46.80960987494729,47.69
2025-05-20,46.96786262495687,47.68
2025-05-21,47.153705784055624,47.99
2025-05-22,47.33121382331824,48.13
2025-05-23,47.454629491805825,48.01
2025-05-26,47.613787766022945,48.33
2025-05-27,47.62037180856422,47.65
2025-05-28,47.553031479734365,47.25
2025-05-29,47.557934847055385,47.58
2025-05-30,47.64376487486349,48.03
2025-06-03,47.95944398852467,49.38
2025-06-04,48.21409053606564,49.36
2025-06-05,48.46607407496279,49.6
2025-06-06,48.74496969769683,50.0
2025-06-09,49.81861157084286,54.65
2025-06-10,50.37704583068961,52.89
2025-06-11,50.92485567965514,53.39
2025-06-12,51.35306373789965,53.28
2025-06-13,51.99796124009971,54.9
2025-06-16,52.451059196445215,54.49
2025-06-17,53.00723025163699,55.51
2025-06-18,53.42046111497572,55.28
2025-06-19,53.42946818498014,53.47
2025-06-20,53.36411033316556,53.07
2025-06-23,53.30518118168091,53.04
2025-06-24,53.23151187592074,52.9
2025-06-25,53.331236989389694,53.78
2025-06-26,53.41101208222793,53.77
2025-06-27,53.70900988545921,55.05
2025-06-30,54.60191717901208,58.62
2025-07-01,55.2088413282826,57.94
2025-07-02,55.47450654132213,56.67
2025-07-03,55.75732353380901,57.03
2025-07-04,56.27053743675282,58.58
2025-07-07,56.96680335734322,60.1
2025-07-08,57.51465729237172,59.98
2025-07-09,57.86471960284958,59.44

Answer: 10.0