helgasoft commented on issue #19668:
URL: https://github.com/apache/echarts/issues/19668#issuecomment-2060613794

   I think this is a **zoom display difference** between _bar_ and _heatmap_. 
Not an accuracy problem. 
[Demo](https://echarts.apache.org/examples/en/editor.html?c=line-simple&code=B4EwhgLmAEC80G0CwAoa6PoOwDYAMeANNLngCzGkAclOAjAEy1060NEk4MWcM2cBmJoNacyHXGR6SaqTJlwBWYUtG58tHNJw5-uLCpy5aVCbu1U9OAJyHrrOfOxYClF9Jd6sjNyzft_Dz43IRC1LHE3KUJHJywIr2U3RXCNEkk3XTcDbPDTNyoPSzdbGLQndPtKUwlTaVM9Kh8SJrUqAJbuauCW0N62yNj5LEL6skaklpTqtJGtGcacluMW_NX64qGFKlKWqpJrVwPySkO9a2asC7VbCVtpW3O-q4EHcrjrSIPo7_PJq-mB1m9geWQOSyuKyua2hFC2GGh512V32NQ4NR4NX4pmaONEpg6BMxeB6plC8PQZPx5HR5GJ42IpkmTOpaVM82g7OxeCWphWDSIFM5eEKjJF3N2plRdCOTROnJl2LouOV-MY6MYmMYsne8iafX1aq-TR-JqVzLogNaGo5rSVvLoxiFTTWLq1xQVkroqPY6PYmPY2IYuOD-IYhPDcN1mHapIYBvjYeN3ADDM5DGZGbDbIYttzQZyzoY_L4ftF6Y97UlDFRAlldcxdexAlxLfxQkF0YwVCEjdJAgNA_bxoEptHzeZAitr3Rr0bWWdAl5S_broE5Z7lYEku3-PE6PEmPE2LIuNPbwqnLIhOvR9JZAND73xqkR7ThWZZCtZDZP6jl8KMFCl5Mh-XGA8N3GE9JTIVFFFleDMXg7FFB8Z1UPxZR0WUJDSUUA18Mw41FFNEiUOZRQrRSTsAJSJCgMUXlGMw11FA3NiUMlRRUXwdF8ExfAdQA-hhCoeh8S4Piuk
 
5LhsRwA15Ik40tAE98cGZdSLwqMS2R0ASgKMUSjAk11zEZXQ5MlGx8RcdF3DKADPEZbxRO8GzCQMTEDGxLADV8mzjQiLz3ywJJnVCmy2QyTlcB83l4hs10Ri8ysrlc1Eagc7S6kZBpctxVpcsJdpMXabEe1Ent8UKdFRlyhlnSoZkmuqtkxNKoCqF5LrqtdSxSsrHZKqqZ1DnRQ5MTORkLlE65psJe55uxawDRW_FPnG6JRvfaxmV29a2RBaagOsXlTvW11rA3K7ltKUb9jGjgxp4Mb-EOZp3tEQ4Om-l6STevA-kOV5iAmmiKgmv600OSYYa-vA0kODkkYBpZDhWM4npFP7Ni7dBDl2AmvplJ6ZRexVQeVYQLj8aAZtJ6SZreuggZZrSnAuL5OfJ6HLWpy1icRlhybBC40cdYm1guUUhWl5nCe9L7fVB_0VZFFWPtDFWfsjbW3vjJhZcTFWuZTE39dhrMVcR3MXvzFW0eLJX8iN8tHn1wmay-usnobUGm39j6239n7exDoSIYHamh39rnRxe8d_dhqdvcRud_dFpdo6dPG6fXX23fXN7t2jh791Bw8K_VunT2p88K5-28so5683ofOuQZrrnXwr6GvzrwFPkRv8K9F0DDdzz4MfAiu3agivCdgr74KexDQeQ9ePow9eAllnCd7e_DqcI9euZIl6yPX2HKOXxG6PXhdJ8Y4-MbY1e3Y49fCe4r7eNB_j_7V3sB9cSzd5D2B-lwF6sl_5A0Uv_LmKkEFvXUtTTS_9EZ6TAZgewotDL_wxroJ6Zk6YWX_oTayoNbJUPlKdIBLlsEYFOrTU6P1PJUJ6KdIG_kqFcyCrwt6oVqYRSoRoWW0VzqCLRglKhUtkqyMEYTK4X1Mp0xymo9WssmjU0Kmon6JVQZlUMUDKqhiuZ1TUdDJqOjphaMRu1Qxosuo6IxpYJ6_VDEeiuoTHYX0xqgwmow_GU06YzQCSw24ATGaPACUDNaASuafBe
 
p8N6u0J6XmsPtAJiMjqhNFqwgJGMrpPSuskrxmTqaZNECTVwQoak8BqfwEmzRmnVIIB0Em0lOlNIIH0EmncSaDFzoMhpBA0wk0mBMtpCMOAkw5HMnpPJhAkxWCTF2wyCDljWYs3YJN9gyhJsQA58pjk9KpkcvAqoLnqiCdAA5XTLk9AOX0y5AzLlfAOT8T5ZzJmXMBAcsRGzhbXLBAcpYYK2l0DWAcrZlyPQHN2Zc_ZJJakbNVnclFPTgzLJJLTGU4ZZkkgeeGLFLzjYYu4ODJw-KvkknGSSX5VsKVpHxfMkkoKSTgs5W00stz8Wwr4FixFXsLk-1FScwG1cZQthxcHDFHY-WAweUIHpUdRVvNHIS-Oor6VTllf8wGgLLzSrZa8VVXKVyiuhYDWFRdRWIt3Bc8udSaSjOPE6lp5A8XkA6T6t1TzyAvKfE6oZxq6Ruvpf3J1BqfyEpHhin8PTx5OtWeQdZYbxhuvheQRFS8Lkr3zRKjeGLUI4u3iW3eGz94Vp6UffNbySKEvPvm-llEy0Guooq--JaOXP3zamt--bYWfxLYin-Fy_4uoARiwSE7PWgJnb6qBE6A3yRxfAmdoaKgyiQZunpqCJ0Gp0ISrBM6OX4JnamohiqSE7uzTYddyLqEYvsi-qVPJPVuQuQYKl8gZTsJfQG3yOKeEvo-TyWlCRv2_JES-o126eRstit-rlMiX3WvkehnpaVv3Isyi69Rip33aIuboxUvqDEYqMVRl5piqNbupdjUZhQenWNIwasShKHFUY5c40jqa3GKo8VR7NQ1SPIv8RiwJUn31hKk96yJLrFpSYDStHF8SpPgaSRclJOnflZKk_BxjuSZT2B6QUqTqbik6dhTdHTiKqlHJqXywZTnNluZaQCtzHSaXeaadK5ZJq3MMb_WTBpZN_N4EmTKf5O7Zk7vCwjSL4L_3VKIy57Gbn4WmcC3gfZyojjKjJk5imdyiuBauWVm5dSqbhe1CVvpyoB
 
nKg-S1ur4zlTRYFiVozoXgVVdBcqFLEsSvQuVFs8b_nvQVfy8rGr6KqZSsYJ5rWZWCVOd1mtp5jBGvktq7-zAtXwvcH8xmQLTKqYssYPM67p2UtOw2-m7d2pjvZZrOd_LYqyt-2-0tmVTm5VNcrcalmXTQf-bVd95rmqAdfJZh1vVAPYszhc-nb7g2s4A9WSzMb65wt2u-7slm-XnXDLoJXMr7rKeefrpTnzTc6f-fbk54NlOQuHfJ3DqQTPotfjS7GlnN3E0s5S6BfnT3qXk4m_PSnRO81lYLQrk5lolulqc-WzrwPnvVs1_5utCvmuNvV3Dy-Cvos33V71jn3bOuDb7Qr7Hg6FcTZHZ1on46yuTrJ9O1US2RJOYXaqHzy7PfbbXQH5rWgDsYFVHDrQ_mD2e9i8egPN2dAJ5S8ZAPEvQu3pYNlh9Af8vPqG8rpyZWGEV7xY6LXkuANDe28BpzoGhutf4RXjrQjm-xdIC56KQ3BvxEC2hobY3MOj_8zhiv-X8Nk8I1CpbJGytkahT5yj43tsVSc3R8b7OY9Qrhyx7f0WWrb6u9x8bg2-PL-x4JmrwnJv-bE8v_LknlTSff0tuT7_q-KbJ8p9_bbNTJzDTd_VrbTMrXTSA6LAzd_K3ffEzRWfzCzd_bHazSAibOzSAonRzO5X0aPdAdUE5X0JpdgFpMg6pdgDpKghpKg0gpVI5dgAZf0AgvAukRgtNDgyZdgf5dgFlPg2gpLDg8FdgVZQMVg9ULZQMeg3ZdgfZYMQrBQ2g0rZbcgyrZbWvP9bFZQp5YMPpPQyg8nWZYML5Ew0gvmRg7rPAlgCQ0MZQ0FYMEQkbaw6FYMKQqFcw2QxWRgubYZAlWgwMHw8g1bRgdbPAzbUI3Qg2Hw5gylPlSMAI8ZcMbgi7cMfg22Hwhw4sZZcMMQ3lOpElAI-FcMWQkVPAr7HbYggOco8gwHA2WwsOco3QyHHbZgmHco0wxOco7glORglHAotH
 
HbBwzHcosQ_OPoqQgnHbWQx1PA0nY1SlWgqnTUcg2nTUaghndY0g5nOY5gqQWwnuOYpIqNOY3ggXOY-ZbgBw5NOYsQmeAozNRgmXTUWQ-XRgRXd44g4td48gjXM7WwnXM7Ug_Xd45go3PA5tCEpIttRgi3CE-AwgrMWglIYEkQ5iWE1wtiZE4o7iHIj3a7VFBYn3XMKVXMcgwPXMagkPa7XQ8PPAjda7PfRE3dRk0gxPa7XglPeky49PRgi9a7XAeEAAXQAG5UAAB9UASAGAeABATgI4UgbQauXAS4cSUU1AVAAAewAAcIAABLTUgAOzgGgAAG9HAABzAAJz1JAAAC5EAhhzSuxbSHSABya020gAEWlIAGVgA3TGEAAbAAUwADMIB3T4JtSAzGEbSLSAALSM6AN06M2M-ECAHU908QGMwM-EBMkMvUxM5Mt0usAAUjdKGAAF8wFnSnBXSUzPSQAABhBMsAQ0w0kMoM_0vMrsUMiMqMvAXMuMospMwc4cjMrMlMr8CsxhAs0cks8s3spwAAehXIAGcEzNSAB3B0iAK0gAVxDMYTXIACMwAABjAAa2tM1IPMNJbM1KDM1KtPdIAGICACAwywzKzdQqzHAhSspMynz9TtSHS6yMB9yiyLSQzXyUywBgA9T1zlyMAEKkKAAFTUvUw0iAWC8C-EdsvUgAW0gANMNIdLDLACDPXJDOrMcBrMcHACgAAC1NTNSiKHTkBdQILMAIAABPbUkM907C9c20kMlCzAMMvUoM3Cq0gAWU1JACEpTMNKNPEsYWAAAEFEL1yABJB8kM4ATi2ZIU6s2sjMgS5St09coMsSq0iSjAKSmS2ChSpS901Szshy9ALSnS_SpSoyxAEyui8oQCxwHypCzip0-EBst04AH0qAHsxhJsvywyh06PfiwS90i8yAEMi0l8viry6ATcncvcw848-EJisAB06AKUqAE8lc6Ae8i89ioikMnC6ATM6AKS4AaAbUq0z
 
U080MjiginSgAFT1OvPAvQCoqLMNIAHU9SIAEyAAZMAU8rs0qo86Af8v88yl0-0lM4AVs9szs7s9MrsZKgygKugRhDKqy7K3CvKq0gqxhYq3cjqsqxhSqh02qsAMBHa9AUK8oPi7SiKx07i6Kg6t0vi-KsARK-ES6_ytK26yy90gANyoqPMKqIuwuRvhBIoCoEDMqiv2vdL4uOo7K7PhouptJABSuupRsypTIetyvysKu-sQBuugGEAEGIB4EUGIDUEZFMr_IAqyhoptJDPXMiohtJpTIlr1KlthupqcHCr0qurxq7BBt8o1ugGjw5oQCBqcDuvdPPPsvqvXLACIu1NssNItPcrUuxrACtKvM0qtJDKqrNKFFEtDJws2vKtzkWpDKIt9P4tDPwtznQGaufLgrdNsuLOtLABeqFHQB1MvMWr4rSoADpFAhQGLc4DaU7wbLxMAeKS7vLQbpaUzFTfzy70B8666vbI75A1b3TS88Ba666AaS6RbLxe75Bu7669rjbUaUyCzIASLtTCqYqFapaKbTqVaW7K76aHSbr4RtakKV67kvrpTOKjb5ASKXa3aPaI7Lwfa2rkz9yjzbkg6Q6w7lKy6nBo6Xz3T46kzE7k7m606LyM7s7c7c4G6KhC7m6uLG7H6S7W7q7-JO7y7AHy7wHLxIG3T26YGS7B6Kh-6nBMGMA4HtqALUAqyRSgA)
   When **zoomed out** bar series _markArea_ starts/ends in the **middle** of 
two ticks. 
   
![image](https://github.com/apache/echarts/assets/13038071/0a3cc4d7-cb52-4406-a9b7-80b519c1b85b)
   
   When **zoomed in** - boundaries show correctly:
   
![image](https://github.com/apache/echarts/assets/13038071/5b555916-9995-4547-ac16-a39ae9d52d59)
   One has the choice what series type to use for _markArea_ according to his 
preference.


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